Here's my case:
I have 2 slicers: 1. Project type(External/Internal), 2. Project Name (only list internal project names)
since I can't add filter to slicer 'Project Name' to display internal project names only, I have to put a dummy name for all external project there.
I would like to put the dummy value at the end of the list. I could use 'ZZZZZZZ', but I prefer chars like '_'/'~' etc.