What is this and how do I turn this off in Solidworks 2016?

I accidentaly pressed some key or imported some image I guess. This box has not gone since then. Does anyone know what this is and how to disable this?

Accepted answer

I think that may be a render area, check the PV360 tab.


2 Other answers

photoview360 & click on render area.

Render tools Tap
See Attach File