How to auto folding in side mirrors when locking the car?

You have to use Bimmercode to set that option, as far as I know.

Then you can either use the fob or the door handle (door handle requires you to hold the lock button for about 1 full second).

 

Just hold down the lock button for a bit.

This may not work on the base model.

 

There is a button where you adjust the mirrors that is for folding mirrors at least it’s there for the iconic trim

 

Also, if you hold down the lock button on the key fob, the mirrors will fold (among other actions).