Since the Activity Group page was reworked the search feature is gone. You only can narrow down the groups by selecting the first and second letter of the group name. Then you have to display 20 more groups again and again.
This makes it almost impossible to find interesting groups with a name containing e.g. London. I can narrrow down the list to groups starting with Lo but how about a group named "Running London"?
Moderator edit: Updated subject for clarity and labels
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