Viewport Filters
Recently Revit 2019 enhanced it's visibility filters by adding an "OR" option which makes this feature even more powerful than what it was. For those who don't understand Revit's visibility settings, one can control elements from being shown or not, overriding colours, etc. eg. some copies of a family (equal to vw symbols) can be visible and other copies of the same family (symbol) can be invisible.
My wish would be to have a filter option for vw viewports. However, for this to work
@zoomer is talking about the Custom Visibility menu item. It can be added to your workspace from the Legacy items.
Custom Visibility either lets you set the visibility of items specified by criteria to either visible or invisible (I don't have VW open at the moment and can't remember is Grey is an option. I don't think it is). It also let's you save small scripts based on the criteria and settings entered.
In a new file, probably the first thing I do is have it create a