Switch map details

I'm trying to view topographical maps on fenix 6 pro. I have then downloaded and can see they are on the watch in the maps settings. But no matter what activity I'm in it only shows the open street maps or what ever its called. The basic map that is used for navigating cities. Do I have to be outside of a city to use the topo maps? How do I select the map style and change it show the different types of maps that come in the watch