I saw this section and figured "Hey, I'm a Newbie..."

I downloaded TVDownloader and YouTube-dl-gui and I have the same question about them both, and they do the same thing I'm asking about. Regardless of what setting I choose for the Video Resolution / Quality, they both download the best video available. I chose 720p in both programs, but the downloads are 1080p. (If 1080p is available, of course.) Is there a way to force them to download in 720p?

Thanks in advance!