Can´t play on my main monitor

I have 2 monitors.

Never had this problem before but when i go into settings i can only choose to play on monitor 2, which isn´t my main monitor.

Tried going into out of fullscreen and drag it to my main but it just pop back to my second monitor when going into fullscreen.

This seems to be the only blizzard game with this problem, if that helps.

Try WindowsKey + shift + arrow to the monitor you want to move it to, then change your display mode twice to get your resolution. Should fix it.

That only make 2 screens. And the main screens picture doesnt move. i can click on it but i won´t see anything :confused: