@Gee – Health permitting (along with the weather), I’d get in the car with the manual and a pad of paper and pen. Turn engine on, find the correct air con, write it down in a way you can remember, move onto the radio, mirror positions, etc. If needed, tear off the page(s) and put them in the glove box.
As for things like cruise control and speed limiter, take the car for a drive, focus on one thing at a time, when you work out cruise control, pull over, write it down.
It’s repetition; getting into the car, checking your notes, setting the car up, having an understanding of what will happen. Eventually you won’t need the notes, it’ll become routine and should stick in your memory.
Of course, don’t read the notes whilst driving, but maybe for the cruise control/ACC, sticky tape the paper with instructions on the dash.
This helped my father with his new car.