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I'm using three 28 inch Dell 4k monitors with Windows 10. Every time I reboot, login, or return from the lock screen, Windows adjusts the zoom level from 150% to 350%, even though it says 150% is 'recommended'. As you might have guessed a zoom level of 350% is unusable, so I have to change it back to 150% multiple times per day.
report it in the Feedback app of Windows 10 – magicandre1981 – 2015-06-25T17:26:21.297