"To improve the design" means to make changes or enhancements to the way something is structured or visually arranged in order to make it better, more functional, or more appealing. Full definition
Using simulation results, students improve the design of their supply chains until they achieve the results they want. (elearningindustry.com)
I hope the developers work out on new improved design for this because it is now getting old to see the same character switching used for puzzles and exploration. (gearnuke.com)
The majority of students are graphic and print designers looking to transition their skills into digital, or product managers looking to improve their design skills. (generalassemb.ly)