Remove screen border while sharing screen

Windows is showing a border when sharing the screen. This was thought as a security mechanism to alert users about the screen being shared. I don't want it because it is breaking my auto-hide Windows taskbar (it won't show up due to that border). When the screen is not being shared the taskbar works again normally. Are you able to provide any Regedit config or any hack to make Windows not show that border?

PS An old good program called Taskbar Activate solves the problem for older versions of Windows (I was using that), but it no longer works due to the latest Windows updates.