I have a new blazer AWD 2023, 3LT (I think) and I upgraded from a 2022 Chevvy Trailblazer. Help answer these questions, please

1) When I switch on Adaptive Cruize control, My car does not break! but gives a warning when approaching another car based on the distance you set. I have made sure that "alert and break" is enabled in vehicle settings. Is this happening to all cars or should I take my car for service?

2) Similar to above, when you are in cruise control and hold down the "Set ++) button, this car stops adding to the selected speed of cruise control. My trailblazer used to start adding speed in multiples of 5 when I did this. Please confirm If your car does the same because this would be so stupid of chevy, for a 2022 smaller car to have better features than a 2023 car.

3) is there any way to manually turn on the side-mirror defrost? It takes too long like 20 minutes (my whole commute) to clear my mirrors and I'm afraid it will be unreliable in winter.