Go to the "Options" page of the "Customize" dialog and click on the "Default" button. That will reset the tools/menus to the way they were when the program was initially installed.
The configurations "tc_1024x768pro" and "tc_1280x1024pro" are also similar, in that they have a "Left" toolbar.
The "tc_1024x768pro_classic" doesn't have a "Left" toolbar; in there it is called the "Drawing Tools" toolbar. This is the original way that TurboCAD was laid out for 15/20 years.
If you select a configuration from the "Load From" list, click on the "Load From" button to load it.
Designer, Deluxe, Expert, Basic, Platinum
Windows 10 Pro, 64-bit