I have connected my new Macbook Air to my existing Samsung large external monitor with a VGA adaptor but I can't get the full mac desktop to display. No icons but then websites are coming up. Help!

I have connected my new Macbook Air to my existing Samsung large external monitor with a VGA adaptor but I can't get the full mac desktop to display. No icons but then websites are coming up. Help!  Further info:  I am a complete newbie to Mac.  Had three macs prior to 2000 then four PCs.  Just come back and struggling a bit with the unfamiliarity. On my old PC laptop I could simply switch from the laptop screen to the large external monitor (and back)  with the F4 function key.  While I can get the background image from my MBA to display, that's it.  Until I noticed on the far left of the external monitor, the very edge of one of the web pages I was on.  So Idragged it over to display in the centre.  But that's all that's there.  And now I have gone out of those web pages but they are still displaying on the monitor.  There is some wierd disconnect.  I'm sure it is just a setting thing.  Will keep searching for answer but any advice welcome!

Your dsplay is getting extended onto the external monitor. Chcnage the setting to duplicate it or only display on the external monitor and you should be fine,
Let me know if this worked for you.

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