Datavideo iCAST MINI Instruction Manual page 36

maximum sub-screen size of the PIP Mode can reach only the 80% of the main
screen.
6. Color: This area provides many colors for you to select as the border color
of the PIP sub-screen. Please tap your desired color to change the border color.
7. The Schematic diagram of the sub-screen size and position: This schematic
diagram for showing the PIP sub-screen border among the whole screen
allows you to know the PIP sub-screen size and relative position among the
whole screen (the black area).
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