BMW X7 Owner's Manual page 183

Displays
CONTROLS
The shape of the windshield makes it possible to
display a precise image.
A film in the windshield prevents double images
from being generated.
For this reason, it is strongly suggested to have
the special windshield replaced by a dealer's
service center or another qualified service center
or repair shop, if necessary.
183
Online Edition for Part no. 01405A385B6 - VI/21