I'm sorry, my English.
I received the ''LG32UN880-Β'' yesterday.
The USB-C cable does not work. Neither the LG cable nor the mac mini m1 cable, I have hdmi and usb-c to Display Port and they work.
By the afternoon I was frustrated and wanted to go back to the monitor!
I chose a little with the settings and without understanding much my screen finally has good light and color.
My setup is this:
LG:
Input: HDMI (from the LG box)
Picture Mode: HDR Effect
Picture Adjust/Brightness: 98
Game Adjust/FreeSync/Extended
Mac mini m1:
Display Scaled: 2560x1440
Color Progile: Rec. ITU-R BT.709-5
HDR: Disabled
What helped me, really this did the trick for me (I'm not sure)

Rotation: 90° and just I waited for 15 seconds.
Now my screen is like the Dell U2720Q, i got it back. She also had a problem with the usb-c (He only did it 3-4 times).