You can try these options:
1) Pressing Alt+Enter during the game.
2) Check your display settings. Make sure the scaling is set to 100% and the recommended resolution is selected.
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3) Create shortcut( RMC on .exe file ->Create shortcut. Then RMC on this shortcut->Properties->Field named "Target"
After .exe" Add " -screen-fullscreen 0 -screen-width 1920 -screen-height 1080"
(with space and without quotes)
It will open the game in window mode. You can change numbers 1920x1080 to more preferred values.
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