Been using One UI 3.1 on my S20. Decided to give Nova Launcher a try. [Used it for years before One UI 3.0] For some reason, Hide Secure Folder does not work. If I switch to One UI 3.1, it is hidden. Not in Nova.
Probably because secure folder is in a different level of system management that nova launcher can't control. What if you turn off secure for from quick panel