Congrats on the new Denali! While driving, it’s hard to imagine these are from the same vehicle line.
Compared to traditional GM cruise controls, the steering wheel only version takes some getting used to.
The Cruise button at the 3 o’clock position is On & Off. You’ll see an icon light on your dash when it is On. Next, hit the Set button at the 6 o’clock position, and the dash will confirm it is engaged and at what speed. The + and - buttons still bump the set speed ip and down 1 mph like your previous Tahoe.
Enjoy your new ride!