@Łukasz-Szmigiel Just wanted to test it this morning.
I use Runna for training plan generation and started a workout + Constantin which ended in a crash and reboot.
I just started the activity and wanted to toggle to Constantin.
1st page, standard overview (pace, distance, etc.), 2nd page map, 3rd page would have been either Constantin or the workout/ interval view. Not sure since the watch stalled and then rebooted.