What

Explore replacing the in-canvas inserter for the Navigation block with a toolbar-based [+] button.
This builds on the existing “Add page” control that currently appears only in contentOnly mode.

Why

See parent Issue. Also...

The inline inserter inside the Navigation block often leads to:

• Layout shifts as it appears/disappears within the menu.
• Ambiguity about which part of the menu it relates to.
• Extra complexity in an already nested editing experience.

A toolbar-based inserter provides:

• A stable, predictable insertion point.
• Clearer association with the Navigation block itself.
• A cleaner canvas with fewer shifting elements.

How

Prototype the updated toolbar insertion behaviour by:

• Updating the existing “Add page” control to use a [+] icon.
• Moving the [+] icon to the end of the block toolbar.
• Removing the in-canvas inserter for the Navigation block when the toolbar version is available.

This exploration will help evaluate whether toolbar-based insertion improves clarity and reduces canvas noise before expanding the pattern more widely.

Visuals