The ArcMap table of Contents has several display modes - List By Drawing Order; List By Source etc (described [here][1]). [![enter image description here][2]][2]

I'm interested to know how or where this is saved - is it saved within the MXD file or is there a system setting somewhere that controls it?


  [1]: https://desktop.arcgis.com/en/arcmap/latest/map/working-with-arcmap/using-the-table-of-contents.htm
  [2]: https://i.sstatic.net/e7l9r.png