Build A Header As A Shared Slot

Goal: Have one header that every page uses, instead of a copy per page.
Time: 5 minutes
You need: Shared Slots access, and a navigation menu with some links in it

1. Select Shared Slots in the sidebar. This lists the reusable areas for the current site, with the pages each one serves.
2. Open the header Shared Slot and select Edit Blocks. A Shared Slot holds blocks exactly like a page slot does.
3. A workable header is a Navbar holding a Container, holding a Cluster, holding a Navbar Brand, a Navbar Navigation bound to a menu key, and Header Actions.
4. To put it on a page, open the page, find the slot in the Slots card, and select Manage Source.
5. Choose Shared Slot, pick the one you built, and select Save Source.

Every page slot renders one of three things, and Manage Source is where you choose:

• Page Content — this page's own blocks. The default.
• Shared Slot — blocks that live somewhere else and are shared with other pages.
• Disabled — nothing renders here on this page.

Switching source preserves the page's own blocks. Point a slot at a Shared Slot, change your mind, switch back, and your blocks are still there.

• Navbar Brand and Navbar Navigation only work inside a navbar. They are not offered outside one, which is the CMS stopping you from building a header that cannot render.
• Navbar Navigation does not hold links — it points at a menu key and renders whatever that menu contains.
• One Shared Slot serves one slot type. A slot built for header cannot be assigned to a footer.
• Header Actions carries the search, theme, and language controls. Its toggles are settings on the block, not separate blocks.