[PROBLEM] Local GUI on 4K screens

[Venerdi]

HI,
Please excuse me if I misunderstood your problem, but I think it's the same thing I encountered on my LG 4K.
My problem was solved like this:
I changed these two lines from the config.txt file
dtoverlay=vc4-kms-v3d
max_framebuffers=2
with
#dtoverlay=vc4-kms-v3d
#max_framebuffers=2
I disabled them, although I think the problem was just the dtoverlay
v.