How do I rearrange the icons

Sselect one of the icons and hold down the Select (center) button on the remote until it starts to wiggle. Then use the direction arrows (the outer ring) to move it to the desired location.

Very similar to how you move icons on iPhone/iPad, but just one icon wiggles.

You can't rearrange the top raw of icons.

You can also hide icons. Press on the Play/Pause button when the icon wiggles.