For this to work with duplicating the screen BOTH TV and monitor SHALL be of the same resolution. What you noted should happen if there is any mismatch.
ok so i have been using my monitor and also a flatscreen, so the same thing shows up on both screens at the same time. i hooked up a different monitor, and since then, on the tv, the edges of the taskbar and surrounding the screen is cut off on the tv, spilling over. i remember that the last time i hooked up a diff monitor, the same thing happened, but i cant remember how to fix it. i've tried adjusting the display on windows display settings as well as intel graphics display, but i cant seem to get it fixed. on intel, the only option under scaling is maintain display scaling. my tv does not have an overlay option. someone PLEASE help me, as i do not have satelight or cable tv, so the only tv we have is through the internet, so if i want to watch something, its going to be cut off along the edges, not showing me the full screen. thanks in advance