Do you have the same issue if you follow the OP’s steps to reproduce it?
Yes
Provide extra information to complete the original description of the issue:
like the other users said. After finishing the first flight, several FMS inputs won’t work for the second leg. One can’t change the cruising altitude to a lower FL for example. Therefore it is not possible to fly several legs with the plane without restarting the whole flight from the main menu.
If relevant, provide additional screenshots/video:
N/A