You cannot. As Almaretto noted, the hardware in the 2020 MY is different than in the preceding MYs. 2018-2019 X3 has a dedicated ASD module in the trunk next to the amplifier. The 2020 X3 has the ASD integrated into the head unit. That is why the ASD menu is available in the 2020 X3 but not the 2018-2019 X3. I can point you to the settings that control the ASD menu shown in post #975 above. If you code them on a 2019 X3, nothing will happen (I tried). If you want to get rid of ASD, my recommendation is to install the Technic ASD bypass harness (
https://technicpnp.com/product/asd-bypass-harness/). It takes less than 10 minutes to do it and ASD will be gone forever.