My computer has two screens. There are four options in the Area setting.
1、Screen 1 (1920*1080): Selecting this will record the screen of screen 1
2、Primary screen(1600*900):Selecting this will record the screen of Primary screen
3、Everything: Selecting this will record all the screens.
4、Custom Area:The screen recording area can be set at will
Location: Set the position of recording screen
Size: Set the size of recording screen
Drag to set position and size