You can hide the top teachers on a Dashboard once you've navigated to the Dashboards screen. You can get there by going to Insights on the Main Menu and opening up Dashboards.

On a Student, Roster, or Grade Dashboard, you'll see the teachers that are giving the most positive and negative Points to that individual or group. You can hide the top teachers for parent-teacher conferences or check-ins with students by clicking settings in the top right, and toggling "Hide Top Teachers" to "On" in the melnu that opens on the left.