Hover over any dashboard widget here you wish to add filters for. Click on the 'Edit' icon in top right corner of the widget.

You will be directed to the 'Widget Configuration' modal. Here, navigate to the 'Filter' settings.

Select a source column, a relevant aggregate function, and assign single or multiple values from the dropdown.

To add another filter, click on the green plus icon. Follow step 1. Then, select “AND” or “OR” operator to define how filters can be applied.
You can also edit (pencil icon) or delete (bin icon) the filter(s) created.

Once you are done, click on SAVE box to apply the filters.

How to add filters to individual widgets in a dashboard?