Ya, near the top of the screen when a movie is playing and connected to a TV, there is a icon with 2 screens on it, hit that, and it will go into presentation mode and your PB screen will turn off like it always does
OK I am streaming from HBOGO.com and I have picture on PB and TV. Mirror mode off turns the TV picture off and PB keeps running. I want it the other way around PB screen off and TV screen on.