Bug - cannot use other app groups

I made a second app group, I would like to use it. But I have absolutely no idea how to do that; when I try to create a scheduled session or a one-off session I get defaulted to my original app group. If I edit it, it ends up editing the group everywhere else it is used - which makes sense but it was the only thing I could think of to try to adjust the group of blocked apps for the specific session. Is this a bug or just a bad UI?

I am having the same issue and came to ask the same question.