Community Tip - Your Friends List is a way to easily have access to the community members that you interact with the most! X
You can select dimensions and remove them from the layer(s) you don't want them on.
Since they were effectively manually added, as opposed to being there by configurable rule, it requires manual removal.
I think there is no 'remove unwanted objects from layer' setting.
You can create and save a Search query to use with a mapkey to make the process a little less onerous.