Diagnosis
The monitor is likely using its native wide-gamut mode without proper color profile management. The default "User" mode targets the DCI-P3 color space, which appears oversaturated on standard sRGB content like Windows and most games.
How to Fix It
Use the monitor's joystick to open the On-Screen Display (OSD). Navigate to Professional -> Image Mode. Select sRGB. This mode locks the color gamut to the sRGB standard and grays out most color settings, providing accurate, natural colors for general use.
If That Didn't Work
If you need adjustable settings, stay in "User" mode. Go to Professional -> Color Temperature and set it to Normal. Then, manually navigate to Color Adjustment and reduce the Saturation level from the default 10 down to 5 or 6.
Heads Up
The sRGB mode locks brightness and contrast. For HDR content, enable Windows HDR and use the monitor's "HDR" Image Mode. The monitor does not have an sRGB clamp in its User mode by design; you must select the dedicated sRGB profile.