I have just switched from Vivoactive 4 to Vivoactive 6. While the latter gives more metrics, one thing is "missing": sleep movement.
The strange thing is that the underlying data is there! It is just not selectable. I can still see movement with the 6 of I go back a day (recorded with the 4), select movement there, and then go forward a day again:
It should be trivial to enable this feature. Please do it!