ScreenWings is designed to prevent malicious (or any) apps from obtaining any decipherable screenshots.
A simple option for keeping your screens out of the hands of malicious actors, when a screenshot is taken while ScreenWings is enabled, all that is viewable is a black image. It will detect multiple monitors as well. One excellent addition for ScreenWings would be an option to password protect the app so that it can run covertly on a shared machine to prevent other users from taking screenshots while using your machine.
Once you have added ScreenWings to your machine, the operation is simple. Click on the monitor icon to engage or disengage. ScreenWings blocks all screen capturing apps, even the legitimate ones, so it is a one size fits all type app. No settings, no whitelisting, etc.