You can watch an animation on this topic at the following link:
The head-up display projects important information in the driver's field of vision, e.g. current speed.
Depending on the vehicle's equipment, different content can be shown in the three areas of the head-up display More.
seat position
image position
light conditions
wet carriageways
objects on the display cover
polarisation in sunglasses
In extreme sunlight, sections of the display may appear washed out. You can correct this by deactivating and reactivating the head-up display.
Depending on the vehicle's equipment, you can select further AMG displays in addition to the standard displays on the Display content menu.
speed and gear indicator
lap and sector times
acceleration and braking
track layout graphics
When you receive a call, the 
Incoming call message will appear on the head-up display.
In audio mode, the station name or track will be shown temporarily when the audio source is being actively operated.