I updated to GPG4Win 3.0.1.
I want to sign a file and therefore right-click on in in the Windows file explorer. under "Mehr GpgEx Optionen" I select "Signieren":
Result: I get Kleopatra with the signing AND encrypting:
But if I wanted sign and encrypt I would have chosen the corresponding menu but I explicitly selected to sign only.
By the way: The correct German translation would be "Mehr GpgEx-Optionen" (with the hyphen).