Ai Jia, regarding your inquiry, this setting can't be changed in a 4s shop, so you can only use it this way. In fact, it is not difficult to change this setting, but every car cannot be perfect. For example, Sega's automatic wipers, automatic headlights and anti-theft systems. Many models in the same class can't reach this configuration.
See more information about [Citroen Sega sedan]:/Citroen -c_quatre_3/