Arctic

One tweak I would do is to the way we add communities to a group. Often many communities have the same word in it. Let’s say I want to add all the ones with Arduino in it, I should be able to select all the ones I want (with a checkbox) after searching for that word instead of having to add them one by one and type Arduino in the search every time.

As to make it more appearance, maybe have the multi-community section always visible in the community list.

Edit; also, having a button that says Addto Multi-Connunity in each community menu (next to favorite and block) would be a nice way to use this.