On September 11, 2020 at 23:43, internetraver said...
I have to be an Ernie and to ask the brand and model number of the projector?
It's been quite a while since I've seen a projector without some sort of lens adjustment.
There might be an easier fix here.
Optoma UHD50x. [Link: optoma.com]
Has vertical lens shift but not horizontal.