Hi @Manfred,
These are segment efforts, right?
I’ve checked mine for several segments, and it appears that:
- if any (even just one) activity includes running power data, the segments effort overview displays power, as on your screenshot
- if none of the activities includes running power data, the overview displays HR
- this means that you’d need to run through a new-to-you segment (with no previous attempts that included power data) to see HR in the overview
...in the other words, the running power seems to take precedence, and it doesn't seem to be customisable. If you’d like to have that option, you should submit it as an idea.