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Go to game install location
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In properties of ModernWarfare.exe and ModernWarfareLauncher.exe
-Untick “disable fullscreen optimizations”
-Untick “run this program as admin”
-Click Change DPI Settings and “untick Override High DPI” -
On the Blizzard app make sure in the game settings of warzone additional command arguments is unticked
If this still does not work for you open task manager and end battlenet updater