How do I reset the active camera to its default position on the interface?

[TheBeanOfLegend 2]

I need help with moving the active camera's view back to the corner of the work camera. Recently my annoying friend came to see me, and I made the mistake of letting him use Mine-imator. Not only did he move it all the way across the top, but he moved one of the sides off-screen so now I can't pull it back.

Surely someone could help?

Help will be greatly appreciated 

Edited January 6, 2017 by TheBeanOfLegend

[SquareToDare 658]

There is a button near the top that enables the Active Camera view
If it is turned on then I don't know whats going on

[TheBeanOfLegend 2]

Obviously it's turned on