Hey freeman3k,
We’d be happy to point you in the best direction to find a solution. To get started, it looks like from your settings, that there’s no issue with NIght Shift or something like that adjusting the color profile, and this is likely just the nature of the monitor. You could try adjusting the color profile from the default one shown for your BenQ SW270C.
For other questions and concerns though, it’d be best to contact the manufacturer of the monitor to see if there’s any changes you can make to the settings of the monitor so that it’s to your liking.
For more info review the following details:
Change your Mac display’s color profile
In Displays settings, you can switch between different color profiles. Your Mac selects the recommended profile for your display by default, so it isn’t usually necessary to adjust this setting.
Note: Certain Mac models use built-in reference modes rather than color profiles. If you have Apple Pro Display XDR, Apple Studio Display, a 14-inch MacBook Pro (2021 or later), or a 16-inch MacBook Pro (2021 or later), see Change Displays settings.
1. On your Mac, choose Apple menu
> System Settings, then click Displays
in the sidebar. (You may need to scroll down.)
2. Click the pop-up menu next to “Color profile” on the right, then choose the profile you want to use.
This is outlined further here: Change your Mac display’s color profile - Apple Support
We hope this helps out.
Take care!