How to search for Entries that have a particular Category set within a Matrix field in the Control Panel? I have an arrangement like this:
Entry type 'people'
└ Matrix field 'offices'
  └ Block type 'office'
    └ Category field 'building'

On the Entries screen, how can I search for people that have a particular building Category assigned within the offices Matrix?
Note: the offices and building fields both have &quot;Use this field’s values as search keywords&quot; checked.
Very simple answer: you just type the category name (no matter whether it's being set within a Matrix field).
The reason this didn't work in the first place was that my search index hadn't been updated properly by the auto-running task that triggered after an XML import I did with the Feed Me plugin.
I simply had to rebuild the search indexes manually to fix the issue.