I've recently encountered a frustrating issue while trying to move realm windows to a 2nd monitor. I'm able to drag them from the main monitor but once they are place they cannot be moved unless I hold the windows key + shift + arrow keys to cause them to jump to the main monitor again. This applies for all the sub windows too, like the spells, items, treasure, etc. The only workaround I have right now is using the windows key + shift + arrow keys combo to move back to main and then reposition on 2nd monitor. Not sure what is causing this, but I've tried several things inside of windows 10 to get it to work. Adjusting resolution, scaling, repairing the install, completely uninstalling and re-installing the realm. restarting the computer, etc.
Please let me know if you find out what is causing this and/or how to fix it. My aging eyesight thanks you kindly. :)