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Very cool viz - what you need to do is connect your parameter to a calculated field that can be used to separate out the chosen region from the others - try this
Test grouping= IF [Region]=[Select a Region] then [Region] ELSE "Other regions combined" end
Then you use it as a filter and on the detail - marks card and color tile see below
and on the breakout by segment like this
and on the d/b making it the filter
Let me know if that helped
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Thank you both for your help. Both solutions worked! Just shows that there are multiple ways to solve a problem in Tableau!