In a dashboard filter, you can select a single value from a dropdown menu.
This mode of filtering enables you to select a single value from a dropdown menu. It
uses a dropdown menu for selection.
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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 the Allow only one item to be selected at a
time option and the Select values from a dropdown
menu sub-option.
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Click APPLY.