I am flying first class for the first time from JFK - DXB in January.

How exactly does order on demand in first class work?

Do they give you a menu and you choose which items u want and when you want them? Do most people tend to order at the same time?

Also, at what point on the JFK - DXB flight do most people close the doors to their suites for privacy? Or, are the suites private throughout the flight. I am thinking it might get boring in a private cubical alone for 14 hours. During part of the flight, I might want to have my suite open and look around the aircraft and other passengers. Is that possible ?

Thanks