I’ve heard that one of the big features of Lemmy is that users from one instance can interact and follow users from different instances. But I can’t figure out how exactly that works. I made a community earlier (on mander.xyz) and when I tried searching for it from a different instance (lemmy.world) it wouldn’t show up. However, a comment I made on another post made by lemmy.world user on lemmy.ml did show up. How does this work?