The phrase "full width" means something that spans or covers the entire width or width measurement of something. It doesn't leave any empty or unused space. Full definition
Also agree we don't use full width of pitch.. (justarsenal.com)
Each apartment runs the full depth of the building with full width balconies at each end and all have a living area of around 200 sq metres, the size of an average home. (thewhitsundays.net)
Some very nice upgrades since our last visit such air conditioning in every room, including the loft and new full width sliding doors and window in the master. (mauiownercondos.com)