You can use this option to select a single value from a dropdown menu in a dashboard
filter.
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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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Click the Display Settings tab, then 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.
