How do I control the info that is seen while doing a running intervals?
The default that is seen is inconvenient.
How do I control the info that is seen while doing a running intervals?
By customizing the data sreen in the settings of the concerned Activity profile. However, since you did not tell which device you own, I cannot advise the exact steps, because they differ from model to model. You best open the User Manual of your watch, and look up the word "custom" in it.