The Before view contains the edits when the DNG is imported. Reset also just resets to the imported DNG settings. To get to the Adobe Defaults hold the SHIFT key down to change the RESET button to RESET (Adobe). After doing a RESET (Adobe) you can go into Before/After View and use the third button on the toolbar with the two rectangles and double arrows to exchange the before and after view settings. This only works if you didn't make any changes after import. If you did make edits after import you have to add a few more steps to retain your edits.