diff --git a/code/core/src/manager/components/mobile/navigation/MobileNavigation.tsx b/code/core/src/manager/components/mobile/navigation/MobileNavigation.tsx
index fdc7de9651db..ddef2c0f2de4 100644
--- a/code/core/src/manager/components/mobile/navigation/MobileNavigation.tsx
+++ b/code/core/src/manager/components/mobile/navigation/MobileNavigation.tsx
@@ -4,6 +4,7 @@ import React from 'react';
 import { IconButton } from '@storybook/core/components';
 import { styled } from '@storybook/core/theming';
 import { BottomBarToggleIcon, MenuIcon } from '@storybook/icons';
+import type { API_IndexHash, API_Refs } from '@storybook/types';
 
 import { useStorybookApi, useStorybookState } from '@storybook/core/manager-api';
 
@@ -17,27 +18,46 @@ interface MobileNavigationProps {
   showPanel: boolean;
 }
 
+// Function to combine all indexes
+function combineIndexes(rootIndex: API_IndexHash | undefined, refs: API_Refs) {
+  // Create a copy of the root index to avoid mutation
+  const combinedIndex = { ...(rootIndex || {}) }; // Use an empty object as fallback
+
+  // Traverse refs and merge each nested index with the root index
+  Object.values(refs).forEach((ref) => {
+    if (ref.index) {
+      Object.assign(combinedIndex, ref.index);
+    }
+  });
+
+  return combinedIndex;
+}
+
 /**
  * Walks the tree from the current story to combine story+component+folder names into a single
  * string
  */
 const useFullStoryName = () => {
-  const { index } = useStorybookState();
+  const { index, refs } = useStorybookState();
   const api = useStorybookApi();
   const currentStory = api.getCurrentStoryData();
 
   if (!currentStory) {
     return '';
   }
-
+  const combinedIndex = combineIndexes(index, refs || {});
   let fullStoryName = currentStory.renderLabel?.(currentStory, api) || currentStory.name;
-  // @ts-expect-error (non strict)
-  let node = index[currentStory.id];
 
-  // @ts-expect-error (non strict)
-  while ('parent' in node && node.parent && index[node.parent] && fullStoryName.length < 24) {
-    // @ts-expect-error (non strict)
-    node = index[node.parent];
+  let node = combinedIndex[currentStory.id];
+
+  while (
+    node &&
+    'parent' in node &&
+    node.parent &&
+    combinedIndex[node.parent] &&
+    fullStoryName.length < 24
+  ) {
+    node = combinedIndex[node.parent];
     const parentName = node.renderLabel?.(node, api) || node.name;
     fullStoryName = `${parentName}/${fullStoryName}`;
   }
diff --git a/code/e2e-tests/composition.spec.ts b/code/e2e-tests/composition.spec.ts
index 8e50987675b5..15bc6c4c4ed9 100644
--- a/code/e2e-tests/composition.spec.ts
+++ b/code/e2e-tests/composition.spec.ts
@@ -11,12 +11,10 @@ test.describe('composition', () => {
     'Slow, framework independent test, so only run it on in react-vite/default-ts'
   );
 
-  test.beforeEach(async ({ page }) => {
+  test('should filter and render composed stories', async ({ page }) => {
     await page.goto(storybookUrl);
     await new SbPage(page, expect).waitUntilLoaded();
-  });
 
-  test('should correctly filter composed stories', async ({ page }) => {
     // Expect that composed Storybooks are visible
     await expect(page.getByTitle('Storybook 8.0.0')).toBeVisible();
     await expect(page.getByTitle('Storybook 7.6.18')).toBeVisible();
@@ -35,10 +33,64 @@ test.describe('composition', () => {
     // Expect composed stories `to be available in the search
     await page.getByPlaceholder('Find components').fill('Button');
     await expect(
-      page.getByRole('option', { name: 'Button Storybook 8.0.0 / @blocks / examples' })
+      page.getByRole('option', { name: 'Button Storybook 7.6.18 / @blocks / examples' })
     ).toBeVisible();
+
+    const buttonStory = page.getByRole('option', {
+      name: 'Button Storybook 8.0.0 / @blocks / examples',
+    });
+    await expect(buttonStory).toBeVisible();
+    await buttonStory.click();
+
+    // Note: this could potentially be flaky due to it accessing a hosted Storybook
+    await expect(
+      page
+        .locator('iframe[title="storybook-ref-storybook\\@8\\.0\\.0"]')
+        .contentFrame()
+        .getByRole('heading', { name: 'Example button component' })
+    ).toBeVisible({ timeout: 15000 });
+  });
+
+  test('should filter and render composed stories on mobile', async ({ page }) => {
+    page.setViewportSize({ width: 320, height: 800 });
+    await page.goto(storybookUrl);
+    await new SbPage(page, expect).waitUntilLoaded();
+
+    await page.click('button[title="Open navigation menu"]');
+
+    // Expect that composed Storybooks are visible
+    await expect(page.getByTitle('Storybook 8.0.0')).toBeVisible();
+    await expect(page.getByTitle('Storybook 7.6.18')).toBeVisible();
+
+    // Expect composed stories to be available in the sidebar
+    await page.locator('[id="storybook\\@8\\.0\\.0_components-badge"]').click();
+    await expect(
+      page.locator('[id="storybook\\@8\\.0\\.0_components-badge--default"]')
+    ).toBeVisible();
+
+    await page.locator('[id="storybook\\@7\\.6\\.18_components-badge"]').click();
+    await expect(
+      page.locator('[id="storybook\\@7\\.6\\.18_components-badge--default"]')
+    ).toBeVisible();
+
+    // Expect composed stories `to be available in the search
+    await page.getByPlaceholder('Find components').fill('Button');
     await expect(
       page.getByRole('option', { name: 'Button Storybook 7.6.18 / @blocks / examples' })
     ).toBeVisible();
+
+    const buttonStory = page.getByRole('option', {
+      name: 'Button Storybook 8.0.0 / @blocks / examples',
+    });
+    await expect(buttonStory).toBeVisible();
+    await buttonStory.click();
+
+    // Note: this could potentially be flaky due to it accessing a hosted Storybook
+    await expect(
+      page
+        .locator('iframe[title="storybook-ref-storybook\\@8\\.0\\.0"]')
+        .contentFrame()
+        .getByRole('heading', { name: 'Example button component' })
+    ).toBeVisible({ timeout: 15000 });
   });
 });