The phrase "across the full width" is correct and usable in written English.
It can be used to describe something that spans or extends over the entire width of an object or area.
Example: "The banner was designed to stretch across the full width of the stage, ensuring maximum visibility for the audience."
Alternatives: "over the entire width" or "throughout the full width".
"He has good quality and he can play across the full width of the pitch.
Two weeks later, on September 13th, he discovered his story printed across the full width of the paper.
There is a spectacular flag painted across the full width of a house with glossy paint like the moist icing on a cake, with chrome yellow stripes instead of white ones.
Insults and challenges were swapped, and by the time the men staggered out into the dawn in an alcohol fug they had signed up to a dangerous race across the full width of the north Atlantic in midwinter.
Former team-mates lined up across the full width of the Headingley pitch to form a guard of honour for a minute's silence before kick-off and McGuire's performance was an equally fitting tribute.
Each little house is a self-contained flat, with a mezzanine bed level that leads on to a roof terrace, while a worktop extends across the full width of the room, in front of a low horizontal window.
You may also consider alternative options, such as a rectangular "runner" cloth that runs across the center of a rectangular table without covering the full width.
It claims to be the longest and most outstanding lateral flat - ones that stretch the full width of a building, or sometimes across two buildings - currently for sale in London's West End.
T-tubule diameters were measured by the full width at half maximum (FWHM) of the intensity profile across their images.
The axial resolution was calculated with the full width at half maximum (FWHM) of the 1D profile taken across each of the two tube boundaries.
The full width of the model is shown.
