Click on a blank area of the Toolbar or Format bar, and drag to the left or right to change the location of the tools on the current bar. Or drag and drop the top bar just below the bottom one to switch the placement of the two bars.

To turn a bar into a floating palette, click (again, on a blank area) and drag it to any new location on the screen. At any time, you can snap the bar back into place at the top of the screen: Just drag it back to the toolbar area, and when the dotted outline changes to a solid line, let go.