This setting allows you to change the maximum size available in the "Button Size" setting for actions bar, pet bar, stance bar and micro bar.
This don't actually change your setting. After defining the max, you still need to configure your ElvUI settings.
Multiple max sizes are only provided for comfort of use.
Choosing a smaller maximum than your current setting will only reduce the maximum from the range setting, but won't actually modify you current button settings.
Initial commit for 8.3