compis
If you have only the option "Open Boxcryptor", then you are directly on the cloud-side (in the physical location) and not on the Boxcryptor drive.
Only via the Boxcryptor drive you have Boxcryptor's options (encrypt, decrypt, etc.)
And second, in Windows 11 you have to go to "More options" when doing a right-click, then you will get the extra contextual options.