Describe the issue
This is both a bug report and an enhancement request.

1. When the caret is inside a menu item, I had expected that pressing Enter would:

• Add a new menu item in the same level as the item I was editing.
• or at the very least add a subitem whose parent is the item I was editing.

2. In any case, defaulting to breaking the line feels like experiencing an unhandled case.

To reproduce
Steps to reproduce the behavior:

1. Start a new post.
2. Add a Navigation block.
3. Add the first menu item, input some text
4. Press Enter

Observed
We remain in the same menu item, but now this item's text contains a line break.

Expected behavior
That's up to us to decide.