An app named "One Switch" has this function: disable keyboard, screen turned black to let you clean your keyboard and wipe the screen. You can use trackpad to turn off this function.
Greetings, Thank you for posting on Parallels Forum. We've forwarded your request to the respective team for further discussion. We don't know when and if it will be implemented, but in any case - we will let you know. Should you have any additional questions, let us know. Have a great week ahead!
