In addition to the video prior to your post, if you don’t have the MIB3 infotainment system (i actually don’t know) – we have the older MIB2 infotainment in our Ateca, and i remember that we have a button on a stalk to get into the driving assists as well (on the speedo-screen).
Since in the Ateca lane assist isn’t always on, i’ve forgotten already – it’s either at the end of the indicator stalk like in the GTE, or it’s at the end of the lower left stalk (the cruise control stalk, if you have one). There definitely is a shortcut on one of the stalks to get into the assist menu on the speedo-screen.
Prior: SEAT Ateca Xcellence Lux 1.5 TSI DSG MY19, VW Golf GTE PHEV DSG MY23
Current: Hyundai Ioniq 6 Ultimate
Next: we'll see what's available in 2028.