Thanks for the support and the
question.
Offline maps are usually best used together with their themes.
OpenAndroMaps + Elevate theme and Freizeitkarte + its themes.
The themes are downloaded automatically with their offline maps.
Their creators decide the zoom level where map elements are
displayed.
We need to modify the map themes, in order to change the zoom
levels.
Or you can enable the advanced menu in "Settings | Application |
Menu".
And use the "Open maps" / "Open theme" menu you know from
Kurviger.
Then you can download Kurviger maps from their
server
and use the attached theme we wrote in Kurviger app.
This process can become easier in the future. Ideas are always
welcome!