I switched to One 3.0, because Nova is laggy as hell after the update. I try to emulate Nova as much as possible, so I create folders, put apps in them, place them on homescreen and then I hide the apps from the apps drawer, since I have them in the homescreen folders. The problem is that after a while these folders disappear from both the homescreen and the apps drawer. If I use the search, I find the apps and they work fine.
Do folders (and the apps in them) disappear because I hide the apps from the apps drawer?
No, I didn't change anything. I had Nova set up as I wanted. I made default launcher the One UI. Then I started making the changes I wanted on One UI and suddenly, when I got back on homescreen, my icons and folders were gone. The only way to bring everything back was to unhide the apps.