Auto Focus; Keystone Correction - Mi Smart M055MGN Mode D'emploi

Auto Focus

Go to Settings > Image > Focus. Auto focus will complete
automatically in about 10 seconds. Afterwards, press the left
and right button on the remote control to manually fine tune.
When the projector does not focus after moving its position,
there are two possible causes:
1. Auto Focus in not enabled. Go to Settings > Projector > Auto
Focus to enable it. 2. The projector's internal sensor was not
triggered when the projector was moved. Simply wiggle the
projector to trigger its sensor or manually focus the projector.
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Keystone Correction

Go to Settings > Image > Keystone Correction. Use the left and
right buttons to select Coarse Tune, Fine Tune, or Reset. Use
the up and down buttons to adjust the screen shape.