Parent navigation entry dropdown is too large

[XFFA.IR Bot]

When clicking the "Parent navigation entry" dropdown in the navigation editor, the dropdown becomes oversized and takes up excessive screen space, making it difficult to use.

Steps to reproduce:

1. Go to Setup > Public navigation
2. Edit any navigation item
3. Click the "Parent navigation entry" dropdown

Expected: Normal-sized dropdown.
Actual: Oversized dropdown that's hard to navigate.

Screenshot:

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