My client is a Mac Mini M1, my monitor is a LG UltraWide 49WL95C-W 49" , the resolution is 5120 x 2880.
I only have 1080P and when I go to NVIDIA settings the option to add a custom screen resolution is greyed out
Affichage > Changer la resolution > Personaliser
also inside the shadow client app, my monitor is detected as Goldstar Company LG HDR DQHD, 192X1080