New to X5 and BMW questions

[BMW X5]

Hey guys, just wanted to say whats up since i will be a new addition to your community and hopefully with time i will be able to contribute.

I have a few questions about the car, i have the 2002 4.4i with all options . Now a few problems i have had in the few weeks of ownership: the driver side headlight is wayyyy to bright compared to passenger yet dealer claims its fine, is that normal? also when the headlights turn on they look blue but then fade to yellowish is that normal? they are XENON

now for the electrical system: the navigation screen stays lit once in a while or shows BMW logo even with the car off and keys out why/how to fix
while changing the volume the system ended up changing the radio station and then ended up changing the computer mode display .

last but not least what the hell is aux ventilation or what is the point of it.

I hope someone can answer these questions

thanks to all in advance