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Fullscreen bug [SOLVED]



Hello, im newbie in gamemaking and im russian, my english is bad.
I make pixel game, main menu have 1920x1080 resolution, other rooms 288x160 (one pixel block is 16x16).
In GMS2 i have a bug: i launch my game in fullscreen, cursor is disabled, but when i touch top right corner with invisible mouse, i can see it sometimes. When i launch game with visible cursor, everything is ok. But i need to disable it. Sorry for bad english, but i really dont know what should i do.