I made a test dataviz from a datasheet with 3 columns Name, Country and Year.
A name can appear several times associated with different countries (let's say the countries they visited), and a country can appear several times associated with different names.
I made 2 maps:
I then a made a dashboard with these two maps, which have the Year filter in common. There is a drop-down list of countries to select the targeted country for the second map.
I now have 3 questions:
Sorry I'm still a very beginner. I'm already impressed by what I did (even if I struggle a lot) :-)
Thanks a lot
Rather than using parameters I think you would be better off trying Set Actions; a new feature in Tableau Desktop 2018.3.
This blog post by Lindsey Poulter should help you get started: On Your Marks, Get Set, Go: Everything You Need to Know to Get Started with Set Actions – Lindsey Poulter