If you're using the projector as a "separate display space" you can also open the display perferances under that same icon which will let you modify the logical position of the displays making the extended space above, below, to the lef, or to the right of your Retina display. "Use as separate display" actually extends your display space so you'll need to grab whatever it is that you want projected and drag it into the extended display space. If you're connected to another source (a second monitor, a projector, etc) you should have choices - "Mirror Retina Display" will "project" the same thing that's showing on your Macbook. Next you'll find the display preferences. You'll see the searchlight magnifying glass, to the left of that you'll see your user name, the time, date and day are to the left of that, the battery indicator to the left of that, then the speaker symbol. 1) Look at the very top of your Macbook display - up in the top, right hand corner. You've got (at least) two ways to deal with this. What's happening is that one of your primary (selected) desktop is being shown on the Macbook's display and one of your other Desktops is shown on the projector. MacBook > HDMI cable > powered splitter > HDMI to VGA adapter > VGA cable > monitor. Having your background only displayed is an entirely different (and much easier) issue to solve. The only way I was able to get this to work was to put a powered HDMI splitter in between the MacBook and HDMI to VGA adapter.
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