Hi there, welcome to community!
You have to open
/etc/X11/xorg.conf.d/20-intel.conf
and
For Intel UHD 620 you will need to add `Option "TripleBuffer" "true"` in order for `TearFree` to work.
Here is how it should look like:
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "TripleBuffer" "true"
EndSection
And remember to check Archwiki to get answer.