This option allows you to change the display settings of a custom filter in a
dashboard. You can select multiple values in bulk, instead of selecting them individually from a
menu. For instance, you can copy multiple values from a table and paste them in a text
box.
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.
Click the Gear icon.
The Settings modal window appears.
In the Settings modal window, under Display
Settings tab, check the Allow the user to add values to the
filter option.
Click APPLY.
The Enter values link appears.
Click Enter Values.
The Set Filter Values modal appears.
Enter values manually in the Enter values below: text box.
Click SET VALUES.
In the following image, you can see that all the four values that were entered manually
in the text box are selected.