This app is useful when you want to balance the camera or image, or when you want to swipe horizontally or vertically. *If you want to draw grid lines, try use my sister brand, "Radial Generator". ・After starting the app, please validate " Allow display over other apps." ・Open the app again. ・Select the number of rows (horizontal line) and the number of columns (vertical line) you want to divide. ・If you want to overlay this app on a full screen app, which hides the notification bar, home bu