You can use this hack for the "L" on the gear shifter to upshift and downshift on the 2023 BMW X1 with X-Line. X-Line does not come with paddle shifters because those only come with the X1 with M Sport.
This only works on X-Line and possibly the non-X-Line base model. Not sure if it works on M Sport, but there's no point, since it already has actual paddle shifters.
(1) hold "L" for 20 seconds
(2) screen will shift from "L1" to "M1"
(3) cruise control buttons now act as upshift and downshift buttons.
video instructions posted by BMW dealership:
https://www.youtube.com/shorts/hR72ARk-nLc