I couldn't see the community I made on lemmy.world in lemm.ee until I searched for it multiple times until it finally showed up. So some users may believe the community they're searching for may not exist, even though it does on an another instance. Best to use Lemmy Explorer just in case when looking for a community.

Well there's no way to make them public from the Settings (yet?) Best thing you can do is be bold enough and ask them haha.

That's one way to get bald alright