Description

When switching to mobile or tablet responsive preview mode in the Gutenberg editor (trunk branch), multiple scrollbars appear on the screen, which creates a confusing and cluttered experience. This issue happens inconsistently but is more noticeable on smaller screen previews.

Step-by-step reproduction instructions

1. Go to the Gutenberg editor.
2. Switch to either mobile or tablet preview mode.
3. Observe the multiple scrollbars that appear on the screen.

Screenshots, screen recording, code snippet

Environment info

• Gutenberg trunk branch
• Operating System:- ubuntu
• Browser: 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