About your first issue, can’t help you, say you pc specs and maybe someone could provide some tips.
About second issue, maybe that’s because you are in training, some functions probably will be blocked until you progress your training.
Since I have more than 1000 hours on X-Plane and lot more on fsx I don’t try the training lessons in msfs 2020, but I believe that some functions will be blocked there until you progress thru the lessons.