The phrase "to improve the visuals" means to make something look better or more attractive by enhancing its appearance or making it visually appealing. Full definition
The game, despite being fun, did age terribly and it wasn't until a sequel was made that the developers returned with the same experience but this time with improved visuals. (gearnuke.com)
Like the PC versions, both games feature improved visuals and twin - stick controller support — the latter of which both games would have greatly benefited from back in the day. (n64today.com)
You will also know what to do to improve the visual quality of the gym and if such items can aid your baby's growth and development positively or not. (checkpregnancy.com)