Just bellow Profile/Settings toolbar button (the top right corner of SeeYou map window) click Map layers panel toolbar button.Multiple layers selection will show up:
. Map type (Terrain, Outdoor, Satellite),
. POI (Points Of Interest),
. and for the experts here is Custom Layer is available ( http://naviter.com/2020/01/get-creative-with-seeyou-cloud).
Note: When viewing or replaying the flight weather layer for a particular date and time is not available (yet! :).