In new maps, the data has to be added and configured first. There are two ways to add data to the maps. The easiest way is to drag & drop data from the atlasFX browser to the workspace. The second way is through the settings of the map service.
Via Drag & Drop out of "atlasFX vector layers":
Via the settings menu:
Open the layer properties by clicking on the name of the layer . Then use the button "Add to current map". After that the layer will be shown on the tab "Map contents".