The buttons to manage GeoJsons can be found in the left panel.
To add a new GeoJson to the application click on the « GEOJSON upload » button in the left panel.
This opens a form to choose a file on your machine. Be careful, the only extension allowed is « .json ».
To delete an added GeoJson click on the « GEOJSON delete » button.
This opens a form with a drop-down list containing the names of all non-native GeoJsons in the application. After choosing the desired GeoJson just press the « DELETE » button.