I have made a map with self made polygons. At the beginning I was so stupid I forgot to add a coordinate system to the new shapefiles. My map is finished now, but I can't export it because the Prj file is missing now.
When I'm trying to change it at the shapefile properties (XY coordinates) the polygon disappears or it moves to someplace in Africa (it is a map from Europe). Does somebody know a solutions for this?