Editor Alignment

Hotkey	Alt+Left or Alt+Right (fiddle 3 positions)
Right-click menu	Editor Alignment->Left
	Editor Alignment->Center
	Editor Alignment->Right

The editor window is centered in the above screen shot, but its alignment can be altered for your needs.

Right-click the matte or editor window. Choose Editor Alignment, then Left, Center or Right.

You can also use the hotkey Alt+Left or Alt+Right to fiddle the alignment options.