The maximum size of a number in Glide is the number + any decimal places.
The default width of a number field seems to be full width.
However, anything wider than a phone-sized device and the increment up/down controls are really far away from the number you’re incrementing.
If not on phone-sized device, then make max width = enough room for say 1,000,000.000, or something more common sense, not full width.
(There is a similar UX issue with toggle switches, the field label is on the left and the toggle control is waaaay on the right, even on mobile devices this looks weird.)