How to prevent Linux mint from going to sleep/turn off the screen?

Question

mint

Good afternoon, I have Linux Mint, the application is running in full screen mode. Mouse and keyboard are disabled.
After a while, 30 minutes \ 2-3 hours, the screen goes blank, turns black.
I connect a mouse - I move, the screen turns on.
In the control panel, sleep / screen savers are disabled.
Where else could it be? Or maybe it's not a dream, but something else? But the screen goes black, after moving the mouse it turns on.

Answer 1

https://help.ubuntu.ru/wiki/caffeine