Try to add in sys.txt :
[rawdisplay]
driver=engine
screen_xy="800_480:800x420/420x800:fullscreen"
screen_x=800
screen_y=420
screen_x2=420
screen_y2=800
If it start, try to increase up to 1020 values :
[rawdisplay]
rawdisplay]
driver=engine
screen_xy="800_480:1020x420/420x1020:fullscreen"
screen_x=1020
screen_y=420
screen_x2=420
screen_y2=1020
Spoiler: img
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