by The Dock sits at the bottom of the screen on every Mac by default, and it will stay there unless it has been relocated either with a settings adjustment or a key modifier. If you’d like to switch the location of where the OS X Dock resides, you can easily do so with either method outlined below, using System Preferences which is the better known method, or the faster but lesser known trick of using the Shift key and dragging the Dock handle to a different region on screen.
Relocate the Dock to the Left or Right with System Preferences
Open System Preferences from the Apple menu, then choose the “Dock” panel
Look for “Position on Screen” and select either “Left”, “Bottom”, or “Right”
The locations are fairly self explanatory, but you may wish to experiment with each of them yourself to get a better idea of how moving the Dock impacts general use.
Something important to keep in mind is that the Dock icon sizes will generally be larger when the Dock is shown on the bottom of the screen rather than the left or right sides. This is because there is usually more available screen space horizontally than vertically on most Mac setups, unless the display orientation has been rotated. The effect is demonstrated well in the accompanying screen shots, and if you prefer to have the Dock on the left or right side of the screen you’ll find that minimizing windows into their Dock app icons is a good setting to enable because it reduces Dock clutter and stops the icons from shrinking too small.
Move the Dock with a Key Modifier & Drag to New Location
If you need to frequently move the Dock location around the screen for some reason, using this key press method is probably the better option because it’s so fast:
Hold down the SHIFT key and grab the Dock’s handle bar, which separates the app icons from the folder icons and Trash, then drag the Dock to the Left, Right, or Bottom of the screen to relocate it to that position
Letting go of the Dock will keep it in the new location unless it has been move again either through the shift+drag or System Preference adjustment.
If you have a Mac that has multiple users accessing the same user account, it’s probably a good idea to keep the Dock at the bottom of the screen so that it will be in the familiar spot for everyone who uses the Mac. This is particularly important if you have auto-hiding enabled or else you may wind up with some needless tech support experiences, as a colleague or family member declares the OS X Dock has vanished from the Mac because they can’t find it (yes, I’m speaking from experience here).
The left setting is probably the most common alternative location:
Storing the Dock on the right side of the display works well if you have the desktop icons hidden, otherwise it may overlap some of your default items, like hard drives and mounted shares:
The bottom location is what most Mac users are familiar with and it is the default:
The shift + drag trick may be better shown through a simple screencast video, which is embedded below:
