How do I change the unit of measure in the "flight data center" when viewing them via the RC Pro controller?

I'm not sure you can. This is an issue which has been raised in the past:

https://forum.dji.com/thread-205705-1-1.html

And on the forum, DJI expressing total flight difference in Feet is another inconsistency.

I wonder........ could one say they are consistent in their inconsistencies? ..........
Oh dear, I will get my coat lol