I had to remove the geocoded hospital file. The would not upload...received an error stating file was too large.
Instead of using a filter, can I suggest clicking on Patient County Name and clicking Show Highlighter.
When a county is selected in the highlighter, the whole state (all data points) will be kept on the screen and the selected county will be highlighted.
A filter, in contrast, will remove data from the view entirely.
Hope this helps,