The feature that lets you ignore or modify selections in a given visualization (actually in the measure) is "Set Analysis". You can read more about it in the Help, books, here on the forums or Qlik Continuous Classroom
You can see some examples of the type of "focus filtering" you mentioned here Focus not Filter | Qlikview Cookbook
There is a QlikView example Search Recipes | Qlikview Cookbook to accompany the article, I'm working up a Qlik Sense version.
Basically, in your scatterplot measures you would add a Set Expression that ignores any SalesRep selection. e.g.