Note: Affect Versions to be refined.
Potential cause: https://github.com/xwiki/xwiki-platform/pull/2142 (XWIKI-16140)

Reproduction steps

1. Click on the quick search field (top right)
2. Type a search keyword (e.g., Sandbox) (note: the keyword is irrelevant a "No result" response allows the issue to reproduce)
3. Wait for the results to be displayed
4. Click somewhere on the page (e.g., on the main content)

Expected

The search field and the results fold themselves.

Actual

The search fields folds itself, but the results stay visible and can't be hidden without leaving the page.