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I have various Safari windows, TextEdit docs, and Stickies notes that relate to different things (e.g. work, home). I want to split these across two Mission Control desktops depending on what they are for. On Mission Control, I can't seem to drag these separate windows or even whole apps (collection of windows via the icon) into a desktop - the drag action works, the plus square appears, but the item then just springs back. Same for hovering it at edge of screen.

Update: these apps had "Assign to All" set - changing to "Assign to None" via Dock did the trick :-)

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up vote 1 down vote accepted

If the item you're trying to move springs back then it's most likely already on the space / desktop you're trying to move it to.

You can also try moving something to another desktop in ways other than Mission Control:

  • Let's say you already setup two spaces, and you want something from space one onto space two; Just drag the window of whatever it is to the edge of the screen and hold it there until it moves over to the other space.
  • Another way you can do this is to simply open whatever application or file you want in that particular space.

Apps are automatically assigned to the Desktop / Space where they are launched for the very first time. You change this by Control clicking the apps icon in the dock, and assign to None.

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Thanks a lot, I didn't know about assign to None - setting this did what I wanted. – Ben Wise Oct 11 '11 at 6:46
I'm glad it helped. ;-) – l'L'l Oct 11 '11 at 7:50

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