I'm using ArcMap 10.5.
I created a few mxd files which have recently been moved to a new subfolder. In those files I originally had polygon-features coloured using the "Category"-feature in the Symbology. Everything worked fine. Now those mxd's have been moved and the symbology I had worked out is not displayed properly anymore. Furthermore I can't even select "Category" in the Symbology (see Screenshot 1). The shape-files have not been moved from their original folder nor have they been altered in any way.Has anyone experienced a similar problem and knows a solution? Help will be greatly appreciated!