Displaying the table of contents on fixed pages is available on the Regular Plan only.
You can add a table of contents to the body of fixed pages created in Shopify Pages, such as an About page or product manual.
Open the app home screen
Select your theme under "Select a theme"
If the selected theme is an OS 2.0 theme, "This theme is Online Store 2.0 theme." will be displayed directly below the selection box.
Click the "Add app block" button next to "Pages"
The theme editor opens automatically on the page template
Click "Add block (or Add section)" in the left sidebar and add "Table of Contents"
Click Save
For legacy themes, the TOC is set up via the app embed.
Open the app home screen
Select your theme under "Select a theme"
If the selected theme is a legacy theme, "This theme is Vintage theme." will be displayed directly below the selection box.
Click the "Add app block" button next to "Pages"
The theme editor will open automatically with the app embed already enabled.
Enable "Page (Vintage theme)" by toggling it on
Click Save