In a dashboard filter, you have an option to select a single value from the menu.
This mode of dashboard controls uses radio button choices to let the user select a
single value.
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Open a dashboard in Edit mode and hover over a filter that is already added to
the dashboard until the controls appear on the top right.
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Click the Gear icon.
The Settings modal window appears.
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In the Settings modal window, under Display
Settings tab, check th Allow only one item to be selected at a
time option.
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Click APPLY.