If you like to create a copy of existing map, you can simply follow these steps:
1) open the existing map with GO TO EDITING or VIEW button
2) click on cog wheel and then select MAP ACTIONS
3) here you can see a line CREATE COPY OF MAP - click on the button COPY
Now a copy of the original map will open so you can rename or modify it according to your needs. It will be automatically saved as a "Copy of" and then the name of the original map.
💡 This way, you can create your own templates - every time you want to use your map as a template, simply open it and create a copy.