Chose to modify the layout to include dedicated arrows on the bottom right. Layers 1-4 are modifiers, layer 5 is a toggle on gaming mode. Tab is dual function: Tap for Tab and hold for L3. So is enter: tap for Enter and hold for Right shift.
On its own modifier layer, accessed from left (between left GUI and ALT) or right (above Right arrow)
Toggled on/off, accessed via the Nordic layer.
Toggle on: L4+RCtrl
Toggle off: L4 (above →)
Use TAB+Z to cycle through brightness (8 steps)
Use TAB+X to cycle through the following LED modes: