[BUG] Removing focus doesn't close Display menu in New Discover

[brucejxz]

Describe the bug

In New Discover, when clicking off the Display menu, it doesn't close.

To Reproduce
Steps to reproduce the behavior:

1. Disable legacy Discover
2. Click on the Display menu at the top of the table
3. Click somewhere else on the page in an attempt to close the menu
4. It doesn't close

Expected behavior
I expected the menu to close, just like the "Columns" and "Sort fields" menus.

OpenSearch Version
2.13.0

Dashboards Version
2.13.0

Plugins

Reproducible at https://playground.opensearch.org

Screenshots

Host/Environment (please complete the following information):

• OS: macOS 14.4
• Browser and version: Safari 17.4

Additional context

N/A

[abbyhu2000]

Were able to reproduce this bug