Unable to capture screenshot. Prevented by security policy. Galaxy S6. Android 6.0

Question

Does someone know how to turn off this screen?

Also phone has a message (Toast) when trying to make a screenshot:

Unable to capture screenshot. Prevented by security policy

.

One of recommendations was to update policy, but didn't help: Menu --> Settings --> Lockscreen & Security --> Other Security Settings --> Security Policy Updates

Screen photo

Answer 1

Go to Phone Settings --> Developer Options --> Simulate Secondary Displays and turn it to None. If you don't see Developer Options in the settings menu (it should be at the bottom, go Settings ==> About phone and tap on the Build number a lot of times)