i3TOUCH V-SENSE 8404 4K T10 User Manual page 42

Choose "duplicate" to see the computer image on both PC display and i3TOUCH, or "projector
only" to see the computer image only on the i3TOUCH.
Make sure the image shown on both your computer screen as on the i3TOUCH is full screen.
Prevent black borders left/right or top/bottom. This means there is a difference in resolution.
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i3TOUCH 04 FHD T10 USER MANUAL