We have just looked into the pilot visibility on the F28 exterior on Xbox and this looks like it is something that is being controlled by the simulator as a performance-saving measure.
For example, if you load into a small regional airport you'll likely notice that the pilots will be visible on the exterior and they may disappear once the drone camera is moved a certain distance away from the aircraft, but if you then load into a large international airport like EGLL or KJFK, you will likely notice that the pilots will only be visible when the drone camera is much closer to the aircraft (if at all).
Unfortunately, I'm not sure if there will be anything we will be able to do to improve this as it looks to be something that is being controlled by the simulator due to performance constraints, but we have logged it on our internal bugs tracker to investigate further.
Mark - Just Flight