I have a category selector in a dashboard that allows users to select multiple values. It feeds a chart. I selected the "None" option, hoping that that would simply result in the chart being blank until someone selects one or more values.
What happens is the opposite - ALL values are charted, which is never desirable and causes the dashboard to be very slow to load.
Nothing is selected:

The chart did not get the message:

When I have the "single" option selected, the first value is what is charted by default and that is fine. Draws fast and the user can change it easily.
Is it possible to have no values selected with the "multiple" option, or to at least have the selector default to a single value?
Thank you,
Randy McGregor