You can easily customize the values displayed on your main activity screen to suit your preferences. For example, you may wish to have “Distance” displayed most prominently during your run. Press and hold on the value you want to change, then select one of the values from the list that appears. Now you have successfully changed the value.
Alternatively, tap the Activity Setup icon next to the "Start" button, then tap “Customize displayed values”. You can then customize the values for both outdoor and indoor activities.