Click on Create new map in the top left of your screen.

Enter the new map name and then select Create an empty map.

If you are part of an organisation the map will be tagged to your team/teams. You can remove any by clicking on the cross in the team tag or click in the team tag area to add any more. Please note if you remove all team tags the map will only be visible to your administrator and you will need to ask them to re-tag it to your team for you to be able to view.