I don't have problem running MS in window mode and I can see title bar. You just have to move your mouse to top of the page (really hit the screen edge) and title bar will appear with . Don't know if this is expected behaviour or not. Maybe there can be added some kind of detection of Win10 mode you're using - Tablet mode on/off?
Tablet: Surface Pro 8,
Other: Strich BT-FP2, USB-MIDI connection to Kurzweil Forte 7