Hi,
I would suggest you to move apps where you want and check if it stays there.
To move apps from the Windows Store around your screen, press the Windows logo key +Left Arrow or Windows logo key +Right Arrow.
To move the Windows Store app to a different monitor, press the Windows logo key +Shift+Left Arrow or Windows logo key +Shift +Right Arrow.
To move desktop apps to the left, center, and right on a screen and then to the next monitor, press Windows logo key +Right Arrow and Windows logo key +Shift+Left Arrow.
For more information, refer to the link.
**Connect a second monitor or projector**
You may try installing latest version of nVidia drivers from the manufacturer’s website and check if it helps.
Hope this information helps. If you have any concerns, please let us know.