The order of commands in the command list cannot be changed manually.
You can click any of the headers (E.G. "Spoken Command" or "Shortcut") to toggle between alphabetic sorting in either ascending or descending order, or no automatic sorting
For a more organized command list, you'll want to assign your commands to categories (this does not affect how commands are recognized), and visually group them by those categories by clicking the rectangular button in the bottom left-hand corner (the second one after and not including "Import Commands")