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Screen brightness during demonstration

virvira
Listener

My screen works fine without demonstration https://monosnap.com/file/AwjzhFEibmR65OqJM5NYrAHx1qiQ6M 
But during demonstration my colleagues see the screen like a https://monosnap.com/file/hZjgstXPCBUY0ltByJ1bsdqDHTPGfG 

What could be the problem?

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