The Navigation block has a ref attribute which "points" to a Custom Post Type entity which stores the inner blocks for the given menu.

However, unlike Template Parts and Reusable blocks which were given visual affordances in WP 6.2, there is nothing to communicate the "sync'd" nature of the block.

I would like to propose that we add both visual and accessible affordances to indicate the status to better communicate that the items are "saved".

Note that I explored this in #46412 but it was not accepted. It's worth reviewing however for visual and code options.

Related

• Apply purple colour and "click through" to Nav block #46569
• Synced blocks: Define them as such in the Inspector #43261