In Sept 2019 I posted on this forum that I was unable to extend a selection in DTTG. Jim’s answer was that the handles function the same way as the traditional ones, even though they look different. But this is only partially true in my case (iPad 2017) Sometimes it works and other times it doesn’t. And also, once I give up and try to deselect the word I had selected before in order to start a new attempt I often don’t even succeed in deselecting that particular word. All in all selecting, deselecting and extending selections are not very functional at this time, at least in my case.
iOS 13 has introduced new issues with text selection. We are currently investigating this and looking to a better text editing experience in general. Thanks for your patience and understanding.