@mdemian, the problem could be the label or the field name, if you are using this derived field in just one place and you want to filter by group names you need to specify the same label for both fields(the derived field and the group_name field), and finally if you have another page with and you are using the similar strategy, you can also set a different field name in the derived field in order to use a different label name, otherwise you and the IManager could be confused about how to use properly the filters, you can also see this entry: Derived field filtering, where we are talking about the silimilar situation
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