How can I change the side RGB lighting on 5075B Plus (or other keyboards with side RGB)

You have two options to adjust the side RGB lighting.

Firstly, refer to the manual for the hotkeys associated with this function. You can find them below:

Brightness Change: Fn+Z;

Animation Speed Change: Fn+X;

Case Light Effect Change: Fn+ Left Ctrl.

Alternatively, you can customize the side RGB through the Akko Cloud Driver. Simply navigate to the light strip page below in the driver. You can download the driver from the official download page.