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What version are you on? This is a built-in feature of Tableau, and it's called 'Highlighting'.
On the Marks card, click the arrow next to 'Host country'. There is an option on the menu called 'Show highlighter'. You will then see a card on your right that says 'Highlight Host country'.
Thank you so much for your response! This helped, however I need to to be apart of my parameter which I am using as a filter in my dashboard, is this possible?