Change lap split after activity

Baso said:

Is there a way to change them and obtain stats for every km?

Yes, enter the settings of the concerned activity profile, scroll to auto-lap, enter, and then change the auto-distance. Also make sure the units are set to "metric", in the global settings.

I'm sorry, but I can't find the option. When I go to the activity I want to modify, I only see 'Laps' at the top, and there's no 'Auto-lap' setting.

You must activate auto lap in the activity before you log the activity. In Garmin Connect you can't add that afterwards. I think that if you sync your activity to Strava you will get the laps data without having to mark laps.

Baso said:

I'm sorry, but I can't find the option.

As Andy wrote, you have to do it before the activity is done, and you have to do it in the settings of the Activity Profile(s) that you use for the recording of your runs (for example Run, Trail Run, Ultra Run, etc) - enter the activity (no need for starting it), long-press the menu button, and scroll to auto-lap. Press Enter again in order to modify the distance.