Windows 10 nay not open applications on the free screen automatically, but you can make programs and/or documents open up on the same monitor all the time. Example: I use one application on my left screen always and the web on the other. To set this - you open the application, drag it to the screen you want it to open on, minimize it to half size (the middle square shape on the top far right - beside the X to close out the app or doc) and then close it out without maximizing it again. From now on it will open on that screen. Do this with anything you want to designate to a certain screen- and it will stay that way until you change it by repeating this process on a different screen. It isn't exactly a fix, but it is very helpful.
