By default, you can specify the distance only on the top and left sides of the screen, but if you move the box and bring it closer to the bottom and right sides of the screen, you can specify the distance from there.
With the latest smartphones and tablets that adopt a full-screen display design, if you place it at the bottom of the screen, the home bar (Home Indicator) for operation and elements will be covered, so be sure to carefully check the actual machine when designing Please try it.
Please refer to this article for how to use the fixed position function.