I’ve hidden the PrivateSpace and forgotten the password on my Mate 20

Same.
Any solution?

Did you register a fingerprint for the PrivateSpace? If yes, you can access the PrivateSpace using that fingerprint from your lock screen.

Now, to get back the PrivateSpace option in Main Space, you can go to Settings > Security & privacy > More settings, and tap Show all settings. After that, the PrivateSpace option should reappear in the Security & privacy menu. You can then go to Settings > Security & Privacy > PrivateSpace > three-vertical-dot Menu button > Reset password to answer your Security Protection question to reset the password.

If you haven't done anything on security protection (you'll not see the Reset password option), then there’s no way to access your PrivateSpace anymore, you can delete it and set up a new one.

How can i delete it since I can't remember the password