You found the correct default to set the thickness of the trim (maybe 1/2″ or 3/4″), but, unfortunately, the height of the trim piece is set by the thickness of the bottom. So there is no setting for making it 13/16″ tall. What you can do manually, for each trim piece, is go to the Window > Extended Entity Info dialog box and use the Cabinet/Resize Mode to Resize Width By some amount (probably greater than 1/16″) and then finish size it to 13/16″.
If you want to use a bottom rail that is proud of the bottom by 1/16″ there are defaults that will permit that. Let me know it that is what you want.