JMGO products supports auto correction for vertical direction, and manual correction for horizontal direction

The auto focus function will work when you
a. power on the projector
b. move the projector leftward/rightward till the function is triggered
c. long press the "JMGO" key in remote control.

Press "Focus -" or "Focus +" key of the remote control to focusing until you get a clear image.

The screen may be burry or foggy when you just turn on the projector, since its key part (optical engine) is made of resin and glass materials.
Due to its own physical characteristics (thermal expansion/contraction), you should adjust on your own, or wait for 10-20 minutes till the projector heats up.