Using single value mode, with radio buttons
In a dashboard filter, you have an option to select a single value from the menu.
In the dashboard's Edit mode, hover over a filter until
its controls appear on the top right.
Click the Gear icon.
The Settings modal window appears.
In the Settings modal window, under Display
Settings tab, check these options:
- Allow only one item to be selected at a time
- [This is on by default] Remember previous selections
Notice that you can only select a single item from the menu.