diff --git a/CHANGELOG.md b/CHANGELOG.md
index aee4fa6..fadb294 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 1.2.1 - 2026-10-13
+
+### Fixed
+
+- Scale and align collapsible bullet chevrons with Presentation 2 text.
+- Keep native horizontal block views visible and within Presentation 2 slides, including when collapsible bullets are enabled.
+- Remove blank separator space from horizontal Presentation 2 blocks.
+
 ## 1.2.0 - 2026-09-13
 
 ### Fixed
diff --git a/e2e/roam-v2-layout.mjs b/e2e/roam-v2-layout.mjs
new file mode 100644
index 0000000..455ccbc
--- /dev/null
+++ b/e2e/roam-v2-layout.mjs
@@ -0,0 +1,303 @@
+import assert from "node:assert/strict";
+
+export default {
+  runtimeNames: ["presentation"],
+  async run({ page, outDir }) {
+    const settingsClose = page.locator(".rm-settings-close-button");
+    if (await settingsClose.isVisible()) {
+      await settingsClose.click();
+      await settingsClose.waitFor({ state: "hidden" });
+    }
+    const fixture = await page.evaluate(async () => {
+      const api = window.roamAlphaAPI;
+      const uid = api.util.generateUID();
+      await api.createPage({
+        page: { uid, title: `Presentation layout regression ${Date.now()}` },
+      });
+      window.__presentationLayoutFixture = uid;
+      const create = async (parent, string, order, extra = {}) => {
+        const uid = api.util.generateUID();
+        await api.createBlock({
+          location: { "parent-uid": parent, order },
+          block: { uid, string, ...extra },
+        });
+        return uid;
+      };
+      const collapsible = await create(
+        uid,
+        "{{presentation2: {collapsible}}}",
+        0,
+      );
+      const slide = await create(collapsible, "Collapsible bullets", 0);
+      for (let i = 0; i < 2; i++) {
+        const parent = await create(slide, `Parent ${i + 1}`, i);
+        await create(parent, `Detail ${i + 1}`, 0);
+      }
+      const horizontal = await create(uid, "{{presentation2}}", 1);
+      const content = await create(horizontal, "Horizontal block view", 0);
+      const columns = await create(content, "Three columns", 0, {
+        "block-view-type": "horizontal-outline",
+      });
+      for (let i = 0; i < 3; i++) {
+        const column = await create(
+          columns,
+          ["Discover", "Build", "Review"][i],
+          i,
+        );
+        await create(
+          column,
+          [
+            "Understand the problem",
+            "Make the smallest change",
+            "Verify the result",
+          ][i],
+          0,
+        );
+      }
+      const rootHorizontal = await create(
+        horizontal,
+        "Horizontal slide root",
+        1,
+        { "block-view-type": "horizontal-outline" },
+      );
+      for (let i = 0; i < 3; i++)
+        await create(rootHorizontal, `Column ${i + 1}`, i);
+      const collapsibleHorizontal = await create(
+        uid,
+        "{{presentation2: {theme:black} {collapsible}}}",
+        2,
+      );
+      const collapsibleContent = await create(
+        collapsibleHorizontal,
+        "Collapsible horizontal block view",
+        0,
+      );
+      const collapsibleColumns = await create(
+        collapsibleContent,
+        "Expand these three columns",
+        0,
+        { "block-view-type": "horizontal-outline" },
+      );
+      for (let i = 0; i < 3; i++) {
+        const column = await create(
+          collapsibleColumns,
+          ["Discover", "Build", "Review"][i],
+          i,
+        );
+        await create(column, `Column detail ${i + 1}`, 0);
+      }
+      const collapsibleRoot = await create(
+        collapsibleHorizontal,
+        "Collapsible horizontal slide root",
+        1,
+        { "block-view-type": "horizontal-outline" },
+      );
+      for (let i = 0; i < 3; i++) {
+        const column = await create(collapsibleRoot, `Root column ${i + 1}`, i);
+        await create(column, `Root detail ${i + 1}`, 0);
+      }
+      await api.ui.mainWindow.openPage({ page: { uid } });
+      return { uid };
+    });
+    const close = async () => {
+      await page.locator("#roamjs-presentation-container > button").click();
+      await page
+        .locator("#roamjs-presentation-container")
+        .waitFor({ state: "detached" });
+    };
+    const checks = [];
+    const originalViewport = page.viewportSize();
+    try {
+      for (const viewport of [
+        { width: 1440, height: 1000 },
+        { width: 1024, height: 768 },
+      ]) {
+        await page.setViewportSize(viewport);
+        await page.locator("[data-roamjs-presentation2]").first().click();
+        const toggle = page
+          .getByRole("button", { name: "Expand bullet" })
+          .first();
+        await toggle.waitFor();
+        const alignment = await toggle.evaluate((button) => {
+          const svg = button.querySelector("svg").getBoundingClientRect();
+          const text = button.parentElement.querySelector(".rm-block__input");
+          const lineHeight = parseFloat(getComputedStyle(text).lineHeight);
+          const top = text.getBoundingClientRect().top;
+          return {
+            iconHeight: svg.height,
+            lineHeight,
+            centerDelta: Math.abs(
+              svg.y + svg.height / 2 - top - lineHeight / 2,
+            ),
+          };
+        });
+        assert(
+          alignment.iconHeight >= 16,
+          "Chevron must be legible at slide scale",
+        );
+        assert(
+          alignment.centerDelta < 8,
+          "Chevron must align with the first text line",
+        );
+        await page.screenshot({
+          path: `${outDir}/chevrons-${viewport.width}.png`,
+        });
+        await toggle.click();
+        await page
+          .locator("#roamjs-reveal-root")
+          .getByText("Detail 1", { exact: true })
+          .waitFor();
+        await page
+          .getByRole("button", { name: "Collapse bullet" })
+          .first()
+          .click();
+        assert.equal(
+          await page
+            .locator("#roamjs-reveal-root")
+            .getByText("Detail 1", { exact: true })
+            .count(),
+          0,
+        );
+        await close();
+        await page.locator("[data-roamjs-presentation2]").nth(1).focus();
+        await page.locator("[data-roamjs-presentation2]").nth(1).click();
+        for (let slide = 0; slide < 2; slide++) {
+          if (slide)
+            await page.locator("#roamjs-reveal-root .navigate-right").click();
+          const columns = page.locator(
+            "section.present .rm-level-horizontal-outline__child",
+          );
+          await columns.first().waitFor();
+          await page.waitForTimeout(1200);
+          const layout = await columns.evaluateAll((elements) =>
+            elements.map((element) => {
+              const rect = element.getBoundingClientRect();
+              return {
+                x: rect.x,
+                y: rect.y,
+                width: rect.width,
+                right: rect.right,
+                textSize: parseFloat(
+                  getComputedStyle(element.querySelector(".rm-block__input"))
+                    .fontSize,
+                ),
+              };
+            }),
+          );
+          assert.equal(layout.length, 3);
+          assert(
+            layout.every(
+              (column) => column.width > 100 && column.textSize >= 20,
+            ),
+          );
+          assert(
+            Math.max(...layout.map((column) => column.y)) -
+              Math.min(...layout.map((column) => column.y)) <
+              2,
+          );
+          assert(layout[0].x < layout[1].x && layout[1].x < layout[2].x);
+          assert(
+            layout[2].right <= viewport.width + 2,
+            JSON.stringify({ viewport, slide, layout }),
+          );
+          await page.screenshot({
+            path: `${outDir}/horizontal-${slide}-${viewport.width}.png`,
+          });
+          checks.push({ viewport, slide, alignment, layout });
+        }
+        await close();
+        await page.locator("[data-roamjs-presentation2]").nth(2).focus();
+        await page.locator("[data-roamjs-presentation2]").nth(2).click();
+        for (let slide = 0; slide < 2; slide++) {
+          if (slide)
+            await page.locator("#roamjs-reveal-root .navigate-right").click();
+          await page.waitForTimeout(1200);
+          const active = page.locator("section.present");
+          if (!slide) {
+            await active
+              .getByRole("button", { name: "Expand bullet" })
+              .first()
+              .click();
+          }
+          const columns = active.locator(
+            slide
+              ? ".roamjs-native-slide-tree > .roamjs-native-collapsible-node"
+              : ".roamjs-native-slide-tree > .roamjs-native-collapsible-node > .roamjs-native-collapsible-children > .roamjs-native-collapsible-node",
+          );
+          assert.equal(await columns.count(), 3);
+          for (let i = 0; i < 3; i++) {
+            await columns
+              .nth(i)
+              .getByRole("button", { name: "Expand bullet" })
+              .click();
+          }
+          await page.waitForTimeout(300);
+          const layout = await columns.evaluateAll((elements) =>
+            elements.map((element) => {
+              const rect = element.getBoundingClientRect();
+              return {
+                x: rect.x,
+                y: rect.y,
+                width: rect.width,
+                right: rect.right,
+              };
+            }),
+          );
+          await page.screenshot({
+            path: `${outDir}/collapsible-horizontal-${slide}-${viewport.width}.png`,
+          });
+          assert(
+            Math.max(...layout.map((column) => column.y)) -
+              Math.min(...layout.map((column) => column.y)) <
+              2,
+            `Collapsible children must remain horizontal: ${JSON.stringify(layout)}`,
+          );
+          assert(layout[0].x < layout[1].x && layout[1].x < layout[2].x);
+          assert(layout[2].right <= viewport.width + 2);
+          const detail = slide ? "Root detail 2" : "Column detail 2";
+          await columns
+            .nth(1)
+            .getByRole("button", { name: "Collapse bullet" })
+            .click();
+          assert.equal(
+            await active.getByText(detail, { exact: true }).count(),
+            0,
+          );
+          assert.equal(
+            await active
+              .getByText(slide ? "Root detail 1" : "Column detail 1", {
+                exact: true,
+              })
+              .count(),
+            1,
+          );
+          checks.push({ viewport, slide, collapsibleHorizontal: true, layout });
+          if (!slide) {
+            await active
+              .getByRole("button", { name: "Collapse bullet" })
+              .first()
+              .click();
+            assert.equal(
+              await active.getByText("Discover", { exact: true }).count(),
+              0,
+            );
+          }
+        }
+        await close();
+      }
+      return { fixture, checks };
+    } finally {
+      if (await page.locator("#roamjs-presentation-container").count())
+        await close();
+      if (originalViewport) await page.setViewportSize(originalViewport);
+    }
+  },
+  async cleanup({ page }) {
+    await page.evaluate(async () => {
+      const uid = window.__presentationLayoutFixture;
+      if (uid) await window.roamAlphaAPI.deletePage({ page: { uid } });
+      delete window.__presentationLayoutFixture;
+    });
+    return { fixtureDeleted: true };
+  },
+};
diff --git a/package-lock.json b/package-lock.json
index 52e9b89..2a9091e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "presentation",
-  "version": "1.2.0",
+  "version": "1.2.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "presentation",
-      "version": "1.2.0",
+      "version": "1.2.1",
       "license": "MIT",
       "dependencies": {
         "reveal.js": "^4.3.0",
diff --git a/package.json b/package.json
index 8407b1c..96d0bf8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "presentation",
-  "version": "1.2.0",
+  "version": "1.2.1",
   "description": "Build slideshow presentations from within Roam!",
   "main": "./build/main.js",
   "scripts": {
diff --git a/src/components/Presentation2.tsx b/src/components/Presentation2.tsx
index f48b06c..62481b2 100644
--- a/src/components/Presentation2.tsx
+++ b/src/components/Presentation2.tsx
@@ -167,23 +167,28 @@ const NativeCollapsibleNode = ({ node }: { node: TreeNode }) => {
         }`}
       >
         {!!children.length && (
-          <button
+          <Button
             aria-label={expanded ? "Collapse bullet" : "Expand bullet"}
-            className="bp3-button bp3-minimal roamjs-native-collapsible-toggle"
+            aria-expanded={expanded}
+            className="roamjs-native-collapsible-toggle"
+            minimal
             onClick={() => setExpanded((value) => !value)}
-            type="button"
           >
-            <span
-              className={`bp3-icon bp3-icon-caret-${
-                expanded ? "down" : "right"
-              }`}
-            />
-          </button>
+            <svg aria-hidden="true" viewBox="0 0 16 16">
+              <path d={expanded ? "M3 5l5 5 5-5" : "M5 3l5 5-5 5"} />
+            </svg>
+          </Button>
         )}
         <NativeRoamContent kind="block" uid={node.uid} open={false} />
       </div>
       {expanded && (
-        <div className="roamjs-native-collapsible-children">
+        <div
+          className={`roamjs-native-collapsible-children${
+            node.blockViewType === "horizontal-outline"
+              ? " roamjs-native-collapsible-horizontal"
+              : ""
+          }`}
+        >
           {children.map((child) => (
             <NativeCollapsibleNode key={child.uid} node={child} />
           ))}
@@ -265,7 +270,13 @@ const NativeSlideTree = ({
       (node) => !hiddenUidSet.has(node.uid) && !HIDE_REGEX.test(node.text),
     );
     return (
-      <div className="roamjs-native-slide-tree roamjs-native-collapsible">
+      <div
+        className={`roamjs-native-slide-tree roamjs-native-collapsible${
+          slide.blockViewType === "horizontal-outline"
+            ? " roamjs-native-collapsible-horizontal"
+            : ""
+        }`}
+      >
         {visibleNodes.map((node) => (
           <NativeCollapsibleNode key={node.uid} node={node} />
         ))}
diff --git a/src/index.ts b/src/index.ts
index 6d42cf3..bf5e882 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -326,19 +326,66 @@ code[class*="language-"],pre[class*="language-"]{color:black;text-shadow:0 1px w
 }
 
 [data-roamjs-native-renderer] .roamjs-native-collapsible {
-  padding-left: 32px;
+  padding-left: 1em;
 }
 
 [data-roamjs-native-renderer] .roamjs-native-collapsible-toggle {
+  align-items: center;
   color: inherit;
-  left: -32px;
+  display: flex;
+  font-size: inherit;
+  height: 1.5em;
+  justify-content: center;
+  left: -1em;
+  min-height: 0;
+  min-width: 0;
+  padding: 0;
   position: absolute;
-  top: 4px;
+  top: 0;
+  width: 1em;
   z-index: 1;
 }
 
+[data-roamjs-native-renderer] .roamjs-native-collapsible-toggle svg {
+  fill: none;
+  height: 0.5em;
+  margin: 0;
+  stroke: currentColor;
+  stroke-width: 2;
+  width: 0.5em;
+}
+
 [data-roamjs-native-renderer] .roamjs-native-collapsible-children {
-  margin-left: 32px;
+  margin-left: 1em;
+}
+
+[data-roamjs-native-renderer] .roamjs-native-collapsible-horizontal {
+  display: flex;
+  gap: 1em;
+}
+
+[data-roamjs-native-renderer] .roamjs-native-collapsible-horizontal > .roamjs-native-collapsible-node {
+  flex: 1 1 0;
+  min-width: 0;
+}
+
+/* Roam's horizontal gutters are measured against the graph viewport. Keep
+   them inside the slide so Reveal's fitting pass does not chase overflow. */
+[data-roamjs-native-renderer] .rm-level-horizontal-outline__children {
+  gap: 0.5em;
+  margin: 0 !important;
+  max-width: 100%;
+  padding: 0 !important;
+}
+
+[data-roamjs-native-renderer] .rm-level-horizontal-outline__child {
+  flex: 1 1 0;
+  max-width: none;
+  min-width: 0;
+}
+
+[data-roamjs-native-renderer] :is(.rm-level-horizontal-outline, .roamjs-native-collapsible-horizontal) .rm-block-separator {
+  display: none;
 }
 
 [data-roamjs-native-renderer] .roamjs-native-source-container img,