The system is supposed to "bounce" you back/off the lane edges/lines. It's not supposed to be a driverless system that keeps you in the middle of the lane.
With that said, there are adjustments you can do yourself using a tool called OBDEleven that allows you to enable "adaptive lane tracking" which will have it follow the approximate center line of the lane. The dealer isn't going to do this for you. Do some searching here/youtube/FB Atlas groups/Atlas forum on vwvortex for more info on the questions you are likely going to have. I have posted the coding for this many times and it's in a thread here that should be saved.