Probably not a good idea, but I'm teaching myself ArcGIS.
Have created a map using the ESRI topographic base map with old USGS topographic maps tiled on top and georeferenced. The map has routes [polylines with M enabled] and points.
I think that somehow I've managed to create this map without having to have a dataframe. Here is an image of the Table of Contents.
I need to create some Group Layers and I can't do that because there is no Data Frame. Is it possible to recover from this error without having to recreate the whole map?