I highlighted some text in Adobe Digital Editions and it is not giving me the option to remove that highlighting. Any other program would allow me to just highlight it again, which would normally remove the highlighting. But the stupid program just made the highlighting (that I didn't want) darker. I went to hit "undo" and the button is greyed out. This is an unbelievably incompetent product. And of course, Adobe doesn't offer tech support, and this question has been asked by others with absolutely no answer.