Show data in table only when end user select ONE option form a multiselect field

Looker Q&A Looker Studio
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1

I have a dropdown control field containing a list of all countries, a map displaying all the countries, and an associated table. I want to ensure that data is displayed in the table ONLY when the end user selects a single option (country) from either the control field or the map. Something like:

IF selectionOfControl = 1 then show data

2

This is going to require a blend. The first part of the blend is just a Count of selectionOfControl, cross-joined with your other fields. You can then create a filter to apply to your table that will only allow data to appear when that Count is equal to 1.