Enbrighten zigbee wall switch/dimmer ramp up/down brightness

Just got a new GE wall switch to replace my defective Leviton. I’m looking for that neat feature to vary the brightness/dimming rate and for the life of me, I can’t find it. Can anybody give me some hints?

Oh… Pi3B+ running HA 2022.9 with a ConbeeII controlled by ZHA.