@Philipat88

You can delete Opera icons from Desktop and Start and use a Shortcut inside another folder (just known by you) or use a Launcher...

You can create another Shortcut + profile for those Guests too.

@Javilg

Depending on what are your needs, creating another profile to make the searches an then clean full browsing data each time maybe might help.

Windows 10 (x64) | Aniversary Update
Opera Stable · Beta · Developer

Test profile | Back ups Mac · Linux · Win