Need computer help. Window stuck open on top of screen.

Worked a double shift and came home to load pics on the laptop. As usual, fell asleep with mouse in hand. When I woke up. My screen was locked in a very annoying position. Everything else is fine, but a medium size screen is stuck at the top of the main window. When I close it, it closes the whole screen. I still have the lower task bar at the bottom and works normally, so I figure I clicked something when i was snooze’en. I tried restore and recovery point and still giloesnna into this window. It’s a real pain since the window on top prevents me from seeing items on the screen. Can someone post info on how to remove the screen and space from the top of the task bar?

What happens when you click the arrow up next to the +?

reboot it

Click the up arrow to the right of the + sign. All you did was pop out a web page by lowering the window at the front( the stuck one) and freezing it so you can compare it to others at the back. Click the arrow and then reboot and update.

thanks, that worked. Appreciate the help everybody!