If you have multiple monitors on your system, Microsoft Flight Simulator 2020 allows you to make a copy of certain cockpit systems or gauges. Then you can drag them to another monitor where they will display as separate windows that you can place wherever you want on the screen. That way you can return to the external view of the aircraft but still see your gauges for more detailed information. You can do this repeatedly for each gauge in the aircraft or as much space you have on the other monitor(s).

For complete instructions and a walkthrough
watch the video below