how to use the function navigate within the running activity

Hi,

just own my fenix 5s for 2 weeks.
I have created through garmin connect several tracks (10km), and then uploaded them in the watch.
I then use the activity "navigate", load my track, and start the run. Navigate give me direction step by step, turn after turn.

When my run is finished, it is saved in my profile as "Navigate" activity.
How could I make the watch to consider this is a running activity (instead of a navigate activity?)

cheers,
seb