The bZ4X Regen Braking button is a one-setting button; it's either ON or OFF. Having said that, regeneration is ALWAYS functional but with the button activated and the green foot-on-pedal symbol illuminated on the center cluster, the regeneration is, let's be crystal clear, very agressive on the bZ4X. So Vern, your Regen is serviceable and operational. Audi has the regeneration settings available on paddles behind the steering and there are different levels of "aggressiveness" for regeneration. Similar system on the Polestar 2 with multiple settings; same on the Porsche Taycan.
I use the regeneration button tactically, e.g. going home coming off the highway at 105km/h on my downhill exit with a STOP sign at the bottom. The way I see it, if I can spare heating up and wearing down my brakes via the bZ4X regeneration braking (RB), I will turn it on. If I go to Montreal, the city of one STOP sign every 300 feet apart, I will probably have it ON and adjust my right foot accordingly in that I won't "let off" the accelerator pedal like I would with an internal combustion engine (ICE) vehicle with or without an automatic transmission. I switch right foot technique from removing all pressure to slowing releasing pressure on the accelerator. It's an adjustment and requires experimentation if this is your first BEV. The bZ4X is no light weight and I suspect Toyota won't be selling brake pads cheap as compared to a Corolla. Word to the wise: here in the Montreal area during winter slush, snow, salt and ice combination, it behooves one to USE the brakes to keep them wearing down in a healthy fashion. Tesla owners reported brakes seizing up due to the lack of use.
I just removed my winter tires and installed my all season tires and combined with the warmer temperatures, I have been noticing a much better energy consumption figure than what I was habituated to view on this energy guzzler bZ4X. I have the FWD.