Running ubuntu, and I have the same problem. I've checked to make sure it's enable in settings, but I still can't drag selected blocks of text.
Creating a new window is far inferior to tab groups, in my opinion. For one thing, the tabs cannot be recovered once the window is closed, for another, it clutters up the desktop quit a bit. Finally, it opens all documents at once, rather than only those which the user requires.
Customer support service by UserEcho