Rearranging pane icons
Rearranging node icons on the Icons pane through drag-drop
Using the mouse, drag an icon over the icon you wish to displace, then drop it by releasing the left mouse button. The icon below will be displaced to the next highest position until the vacancy created is filled.
E.g., if you have 6 icons in positions 0-5 (0 being the default icon) and you wish to move #4 to #2, drag and drop #4 on top of #2. The new order will be 0, 1, 4, 2, 3, 5.