How do I change from unified to extended display - two monitors

[FSandefur]

This is really about preventing me from doing something embarrassing because I should really know better...

First the basics: Kubuntu 16.04, just updated to Plasma 5.8.4 I have one monitor on DVI-I-1 (set to primary, and a TV on HDMI-1. Both are running at 1920x1080

Both work well, things function like they should, only one thing I'm not happy about. Unlike what I had previously in 14.04, my desktop icons duplicate over on
the TV and I can't get rid of them. In 14.04 my taskbar, icons, widgets, etc where all on my primary, and the TV was essentially a blank screen.

I think what I did was unify the displays accidentally. That assumes I actually am correct in my understanding that 'unify' is very close to 'clone' in meaning.

So my question is: how do I get rid of the icons on the TV side of things, without completely botching the primary monitor sitting on my desk?

[FSandefur]

and Here I thought there would be a really simple answer to this that I had just managed to overlook

[GreyGeek]

The answer might be simple. In my case I have plugged in a second display only once in 19 years of using Linux, and that was about 5 or 6 years ago, so the number of people in the pool who could answer your question is pretty small. Searching the web I find:

http://askubuntu.com/questions/81386...a-quadro-k2200

Some techniques to try are here:
https://sites.google.com/site/easyli...roject/display

but use sudo in place of gtksu and kate in place of LeafPad.

[FSandefur]

Thanks for the help. I will never ceased to be amazed that different people searching the internet for the same thing somehow manage to find different things. I'll give these a try, and see what I can come up with.

[GreyGeek]

Sometimes it seems like it is the luck of the draw, doesn't it? Just re-arranging words can produce amazing differences in results.