With Desktops, you can have more than one Desktop.

I want to assign absolutely only one Desktop, not two.

How do I do this exactly?

When I click F3, it looks like this:

enter image description here

(Does that mean I have only one?)


Buscar웃 has identified the issue. I manually deleted the 400 desktops and now this issue:

Absolutely eliminate "Automatic new Desktop when dragging"

is finally resolved.

  • did you try, Press F3, hover over desktop window, click the x to delete it. – Ruskes Dec 1 '18 at 3:57
  • thanks for that great tip to begin with! I will edit ... – Fattie Dec 1 '18 at 4:00
  • I had no idea about F3 - thanks for that. There does see to be ONLY ONE desktop - is that right? Notice the white square in the posted image. – Fattie Dec 1 '18 at 4:14

That is amazing.

You have created so many desktops that macOS can only display them as a dot.

That line of dots represents your desktops. I did not count but it must be more than 50.

How to delete them.

Press F3

Hold Option Key and keep clicking on the X showing to delete them.

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  • THANK YOU SO MUCH - I will get on this and get back to you .. – Fattie Dec 1 '18 at 17:25
  • It really takes a long time. 250 so far. – Fattie Dec 1 '18 at 17:30
  • I stopped counting at about 300. I guess about 400. It is really hard to delete that many due to the silly animatio which doesn't align. You're a lifesaver. Now to figure out what was going on. Maybe itrelates to using two monitors?? – Fattie Dec 1 '18 at 17:33
  • That is a good question. "Why do I have hundreds of Desktops" ? post it as separate question. – Ruskes Dec 1 '18 at 18:01

To your second separate question

Why do I have hundreds of Desktops

Open System preference > Mission Control.

Un-check the Displays have separate Spaces.

That should stop it creating new Desktops.

enter image description here

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  • Done; in fact it was off. Could be, in the past I had it turned on, and, for some reason the Desktops built up then. I will see what happens going forward! Thanks! – Fattie Dec 2 '18 at 2:47
  • OK, lets see, at least now you are starting new – Ruskes Dec 2 '18 at 3:31

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