Unfortunately I have not found a way. It doesn’t look like that feature exists right now. I keep toggling back and forth between Mlem and MemmyApp. They’re obviously both brand new, but it’s funny how the features implemented in each are almost exactly opposite. One has multi-account support, the other can swipe. One can open pictures, the other can search communities. If they merged they would make for a great app. Just need to give them time.