Luminaires that are paired to your network will be displayed in the Luminaires tab. Each will have an icon picture and name. Luminaires that are online (i.e. powered) will also show a bar indicating the current brightness level and light colour.
Luminaire or Group icons shown in the Luminaires tab can be rearranged by pushing Edit, selecting and holding the icon, then dragging it to a different position. Release the icon in its new position. Push Done when finished.