Why make that change? The online U2723QE User's Guide page 58 shows all that the Menu- OSD factory default for Contrast is 75%. Set it back to 75%. Then make any Contrast changes to the U2723QE from the macOS display control panel.

No, there has still been no improvement. When I select SRGB, the color turns gray, but when DCI-P3 is selected, the color green prevails. Contrast and brightness 75%

I open a black and white photo from the MacBook Pro. My Dell monitor is seen as green and blue, I think there is a problem with my monitor, what should I do, can you please help? It's only been 24 hours. And my work was very disrupted, I tried all day to fix it, but I couldn't.

When I used it as a DCI-P3 over the screen, a green color prevailed. I read an article from another forum explaining that I need to get the screen to 6500K and choose the color profile DCI-P3 from the screen settings on the Mac. And I applied it. At the moment my monitor has great color accuracy. MacBook Pro is incredibly close with a nur XDR display. My problem is solved and I'm in a good mood

Contrast setting should not be modified on an LCD. It's not a "real" control. Contrast is static contrast of panel... and cannot go over default value.

Read your manual to "factory reset" OSD values. Then lower brightness till you find it comfortable.

Please clarify. Are these your current U2723QE Menu settings?

* Open the U2723QE Menu
* Go to Color
* Go to Preset Modes
* Go to Color Temp
- Change to 6500K
* Go to Color Space
- Choose DCI-P3
* Go to Input Color Format
- Choose RGB

Then you changed to DCI-P3 in the macOS screen settings?

@eraxius​ thank you, you saved me T______T