The top view of each layer includes the background image on which all elements of the next layer are displayed. For example, the floors are displayed as the top view inside buildings, rooms inside floors and so on. For background images, raster formats (.jpeg, .png etc.) and vector formats (AutoCAD, .dwg, .svg) are supported.
You can use the mouse wheel to zoom in and out of the screen and press and drag the mouse wheel to move the map around.
If you want to add objects in the top view, select the corresponding option from the context menu.