Constraining Virtual Joysticks?

Is there a way to make a virtual joystick stay in one place (bottom center) on all devices? I don’t mean prevent recentering, I mean, when I play in editor the virtual joystick is in the bottom center portion of the screen and is the perfect size. But when I launch on my phone it shrinks considerably and is on the right side of my screen in the middle. Is there a way to constrain it, like you would a ui element? I want it to be in the same place on PIE as well as phones and tablets.