I use Adobe Acrobat Reader DC daily and frequently have multiple documents open at the same time. I open several docs at once and then use the tab interface to move the tabs into the order I need them in to accomplish my tasks.
During an online session with my IT department they uninstalled Reader DC reloaded it from the website. After the re-installation the program will open the multiple windows with tabs, but I can no longer move or reorder the tabs. It advised this might be a new version and that function was disabled. I checked the version numbers before and after the IT session as they are the same.
Is there an setting that can be changed to allow the tabs to be reordered with multiple windows open?