On a MacBook Air running OS X Lion, I have a dock bar at the bottom of the built in screen, how can I move this to my external screen? I've already got the menu bar moved, but the screen system preference control does not appear to also control the dock location.
Mac – How to move Macintosh bottom dock bar from one screen to another
dockmacbook-airmultiple-monitorsosx lion
Related Solutions
I fixed it by restarting my dock. Open the Terminal app and type killall Dock.
I think it's the dock getting into a bugged state; running this command restarts it and makes the dock behave correctly.
What do you mean by "bottom bar"? The dock?
Hiding the dock
Version 1 - Hiding
By pressing alt+cmd+D you hide it (works also by clicking "Turn Hiding On", see below). It will then disappear but reappear when you move your mouse over the Dock area at the bottom.
When hidden, application windows take up the full space, so maybe this is just what you're looking for.
Version 2 - Making it really small
If this isn't enough, you can also go to Terminal.app and enter:
defaults write com.apple.dock tilesize -int 1
killall Dock
Then the dock will be so super small that you won't even notice it. If you hide it then, it won't get in your way. There will be just a very tiny area that you have to hover over to see it.
Version 3 - Removing it entirely
There's a programm called DockDisabler, which is supposed to remove it entirely.
Warning: This may break some things so I wouldn't recommend it unless you know what you're doing.
Moving the Dock to the side of the screen
Just right-click the dock these stripes you see on the right, and change the position.
Note that all of these commands can also be accessed from the Apple menu (under Dock), or in System Preferences → Dock.
Best Answer
The Dock is on the bottom screen if the arrangement makes them overlap vertically.
Otherwise, it's on the screen with the menu bar, e.g. in the following two arrangements:
AFAICT, the reason is that the Dock requires you to move the pointer to the screen edge if it's hiding, and that only works for the bottom-most screen.