Change the position and size of the view:

POS_X 0;
POS_y 0;
SIZE_X 640;
SIZE_Y 480;

Set the default view off and on to save framerate:

IF (OverHeadView.VISIBLE == ON){
SET OverHeadView.VISIBLE,OFF;
Camera.VISIBLE = ON;
} ELSE {
SET OverHeadView.VISIBLE,ON;
Camera.VISIBLE = OFF;
}