[makkan00]

You have following options;
1- BMW without any dip option (so inner mirror does not dim)
2- Inner mirror dim (as mentioned above that there is small circular thing)
3- Option 2+ folding and auto dip passenger mirror
4- Option 3 and auto dimming side mirror

To check option 4, you find the small rectangular box on back right side of central mirror. This rectangular box is facing forward. Put you finger on it so it get the impression that its dark outside.

Now turn on the flash light / torch on your phone and take it close to the small circular thing (which is facing toward you and it mimics that there is a car behind you with lights on). Your central mirror will auto dim and if your exterior mirrors are one with auto-dimming option, they will become dark as well.

HTH.