It is located in the upper left corner of the Screen. You can choose a region whose image model to display on the Screen. You can also switch regions on the open Screen by clicking on the appropriate row of the Table of regions
Picture in Picture automatically appears when the screen resolution is not enough to represent camera resolution or when using the Digital ZOOM.
In the PiP mode on the Screen 2 pictures are displayed simultaneously . One of them is a general view - shows the whole field of view, but with screen lower resolution. Another picture - a particular view - shows the target region of the field of view, but with the original camera higher resolution.
PiP mode allows to represent megapixel camera resolutions on limited screen size.
In this case changing the screen size changes the size of the cut frame in the field of view of the panoramic camera. At the same time, picture resolution is maintained equals to expected resolution of panoramic camera at the center of the screen without use of PIP.