Slicer has filter I cannot clear

How do I clear this filter please? File was copied from another file, but I have deleted all content. Problem is when I add a slicer, even before I add the data field, it has a filter I cannot seem to clear on the data field called "TS Period Desc".  😞

I would create a new file, but I actually was hoping there was a way to clear it so I can clear it in my other file that has alot of data in it and I'd rather not have to start all over again.  Thanks in advance.