A wealth of information on how to use Maps can be found on the Digital Earth Africa User Guide website here : https://docs.digitalearthafrica.org/en/latest/maps/index.html.

For the splitter functionality: https://docs.digitalearthafrica.org/en/latest/maps/index.html#Use-the-splitter-functionality

Help on how to use Maps can also be found here: https://maps.digitalearth.africa/about/help?lng=en#use-the-splitter-functionality