Cristian, I think I may have misread your comment. In Exposure, you’re right in that you can’t select and delete all layers in one button. You can push the Reset button, which will remove all edits from the file, including any layers you have applied. You can also use the delete button on your keyboard after you delete a layer in Exposure to quickly remove layers you don’t want.

Thanks for commenting. Last time I checked, Lightroom didn’t have layers functionality. I could be wrong, though. I use Exposure for all my processing, now.