The most efficient way to remove “holes” in a grid of buttons
When you need to rearrange buttons, remember the following:
* Dragging a button on top of another button will swap them.
* Dragging a button between other buttons, or to the edge of the grid, will shift them to fill the hole you just created.
* Empty button locations can be dragged just like a button
Note that shifting buttons around as shown, may shift function or navigation buttons, which need to remain in a set location. (See Moving content buttons can displace function and navigation button)