Dual monitor default background image


i use powerpoint church. connect mac facility's projector there image pops up. come from? can change it? once start slideshow background whatever selected when set show wallpaper seems kind of default illusive. of course, when i'm @ home have 1 screen can't figure out. help????
 

when have projector connected, open system preferences, desktop & screensaver pref pane.
see pref pane on both mac, , projector screen.
and, can change background on projector screen else (independent of background on mac). created second background pure black, name of church in small faint letters on screen. way, it's relatively unobstrusive, can tell @ glance projector working, , computer providing image want, ready powerpoint/whatever.
 


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