When you have a long list of extensions, it would be helpful if you could filter them by name.
So we should add a search field to the extension dialog at "Tools->Extension Manager".
Samuel Mehrbrodt committed a patch related to this issue.
It has been pushed to "master":
tdf#126672 Add search field to extension manager
It will be available in 7.4.0.
The patch should be included in the daily builds available at
https://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.