⚠️ As of February 25, 2026, Atlas no longer generates or imports themes. If you already have the Atlas theme installed, your theme is unaffected and everything in this article still applies. New users can use Atlas to generate pages and import them into any Shopify theme.
Sections and blocks are how you build a page in the Shopify theme editor. Sections are the horizontal bands down a page; blocks sit inside them. App blocks are blocks provided by an installed app, including the Atlas Bundler.
In this article:
Adding a section
Open the theme editor and select the template you want, using the selector at the top.
Select Add section.
Choose a section type.
Configure it in the right-hand panel.
Select Save.
Adding an app block
App blocks come from apps you have installed.
In the theme editor, find the section you want the block inside.
Select Add block.
Choose the Apps category.
Select the block.
Position it and select Save.
ℹ️ An app must be installed before its blocks appear. If you cannot find a block you expect, confirm the app is installed and that it provides theme blocks at all. Not every app does.
Adding the Atlas Bundler block
The Bundler block is what makes bundle offers visible on product pages, and it works the same way on the Atlas theme as on any other.
Open your product template in the theme editor.
Select Add block in the main product section.
Under Apps, choose
Atlas Bundler.Drag it directly above the add to cart button.
Select Save.
⚠️ Add it to every product template your bundled products use, not just the default one. A block on one template does nothing for products using another.
Full detail in How to add the Atlas Bundler block to your theme.
Reordering and hiding
Reorder by dragging sections and blocks in the left panel.
Hide using the eye icon on a section, which removes it from the page while keeping its content.
Shopify's limits on sections and blocks
Shopify sets three limits that matter here:
Limit | What it counts |
25 sections per template | The sections on one page template |
50 blocks per section | The blocks inside one section |
300 block files per theme | The block files stored in the theme's code, used or not |
When a template or a section is full, the theme editor stops letting you add to it. Remove a section or block you no longer use to make room.
When the theme's block files are full, Atlas publishing stops with This theme has reached Shopify's 300-block limit, so Atlas can't add this page to it. Publish to a different theme, or contact support and we'll help you publish it here. Deleting sections does not help with that one. See Fixing "This theme has reached Shopify's 300-block limit".
If an app block is not available
Cause | Check |
The app is not installed | Install it |
The app provides an app embed rather than a block | Look in Theme settings, then App embeds |
The section does not accept app blocks | Try a different section |
The section already holds 50 blocks | Remove a block you no longer use, or use another section |
The app does not offer theme blocks | Check the app's own documentation |