Minecraft bedrock completely logs you out and back to the home screen whenever you open a program.  This only occurs when bedrock is in Full screen mode. 

Java does not have this problem. 

A work around is hitting F11 and keeping the window out of full screen mode. 

To reproduce, open Minecraft bedrock and start playing in a world. (Mine is in realm)

then while in full screen mode with no toolbars visible, open a program infront of it. 

(I have two monitors, do i dont have to minimize the program to open another program) 

If the program opens on the monitor with bedrock on it, it will kick it back to home screen every time.