ok it seemed to be a caching issue. It actually works.
Then I am gonna ask about that search. I see there is a
[“search_terms”]=>
bool(false)
in $BP_User_Query, but it is set to false when I was actually searching for sth and $_GET is not empty. Also, when I then go back to the main members list, the “search filters” still appear above the list but $_GET is empty. This is weird behaviour I think in terms of usuability. But other than that I wouldn’t know how I could access that data to modify the query for the search terms?