Filters in Portal (and AGOL) are based on the presence of a specified type but it could also be useful if we had the option to exclude certain types of content. For example, let's say I want to browse my organization's content for new apps/maps that others may have created. When I view my organization's content, I get a list of several dozen hosted feature layers that have been updated/overwritten because we've chosen to place a copy of each dataset into our Portal hosted features (they're updated weekly, if perhaps even nightly).
If I was able to exclude a layer type item, that would reduce the unwanted noise I see when I'm browsing content. This could be implemented perhaps as a toggled list where every item type is enabled by default and then the user can toggle off the item types they are not interested in.
