Highlight borders of a country

Dear @evo252,

Unfortunately no, unless you know how to code with Javascript.
In that case, you would need to follow the developers guide here to interact with the map object:
https://camilles-travels.com/get-started-with-travelers-map-wordpress-plugin/#Interact-with-the-maps-objects

And have a geojson object of the country’s border to import into the leaflet map (following the leaflet documentation)

Thanks for your quick response!