Description

Currently, when a user creates a new post or there are no blocks in the editor, the List View panel on the left shows a blank white column. Adding a “No block selected.” message would improve the user experience by providing clearer feedback.

Step-by-step reproduction instructions

1. Create a new post
2. Click on Document Overview
3. Notice that the 'List View' Tab is blank when no block is selected.

Screenshots, screen recording, code snippet

Environment info

• WordPress 6.7.2
• Gutenberg 20.5.0-rc.1
• Twenty Twenty Five
• MacOS Sequoia
• Chrome

Please confirm that you have searched existing issues in the repo.

• Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

• Yes

Please confirm which theme type you used for testing.

• Block
• Classic
• Hybrid (e.g. classic with theme.json)
• Not sure