It is a bit difficult to answer without seeing any workbook. But what i can imagine from your questions:
1.In this case you can maybe switch by using a case switcher in a calculated field e.g. :
CASE WHEN [Country] = "France" THEN "EU" etc etc.
2. In this case a parameter would enable you to either see countries or operators. You would need to give the regional operators a lat and long value. Create a parameter with "View" or something similar. Then create a calculated field where you read the parameter and return the [country] or the [regional operator] dimension.
If this is not what you wanted, please post a workbook that we can work with. Add dummy data if it is a confidentiality issue.
Hey Derk welcome to the forums! You've been posting some good answers. But that quickie CASE statement of your's may be a bit misleading for newer members. It looks to be a mash-up of a CASE and IF as far as syntax goes. I suspect you meant:
WHEN 'France' THEN 'EU'
WHEN 'Germany' THEN 'EU'
That said, it's great to have another knowledgeable Tableau user aboard!
You are right! I mixed up with MySQL syntax. There it is possible to mix if statements inside of a CASE Switch.
Then again, it is easiest to solve these issues when actually seeing it in front of you in Tableau.