How do I delete email from the S Planner?

[AC Question]

how to delete email from s planner

so basically my s planner is clouded with stuff from my high school from which i graduated 2 years ago, how do i get rid of them from my planner? all of it is coming from my main email and i would like to just delete it all together from s planner and just have my student email so i just have my university planner instead, right now its just a mash of both and its unnecessarily full.