I never knew anyone to do that (seems more tedious to me than copy & paste keyboard shortcuts) but I confirmed it worked in 7.6.1.3 and doesn't work in MAS. This change is related to how content is displayed in MAS. The masthead (top navigation bar) is universal for all the applications and then renders the application (Manage in this case) content inside an iframe. Anything in the main header bar you can still drag and drop outside but because the Manage content is inside an iframe you can't. I don't know how but maybe there is a way to modify the iframe in a way that it allows content to be pulled out of the iframe. Definitely not a system property to control this today though.