It is a sit down restaurant. We love it and have lunch there every trip.
However, it is currently hosting the character meals for the GF at breakfast and dinner because 1900 is closed for remodeling. It is not open for lunch during this time. I think 1900 reopens in early October and the GF CAfe should start serving lunch again then.
In the mean time, Citricos on the 2nd floor of the GF is serving lunch. At breakfast and lunch, the menu is the same as the GF Cafe's usual menu.