Did you know that we can not centre element inside a floating group because you can only set it to align left or right, not centre.
Try this, make a floating group full width and stick a button in the centre. Preview the page and slowly drag the page narrower, at some point it will no longer remain centre and will go off to either the right or left.
You can try and put a normal group inside the floating group and centre the button inside that, but same thing happens.
This problem means I can not make a mobile responsive footer navbar because it never remains cantered.