I am a tutor and I currently have to use the projector to trade name this hapen, but I often switch to a dvd or regular laptop mode and I hae to invert the depiction back again.
Answer:
Hold down Ctrl + Alt, after press one of the arrow keys. ; )
Works on 99% of displays. : )
This would be a characteristic on the projector in the setup menu to invert the eyeshade.
This is an option you hold to change on the projector.
read the instruction manual of the projector
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