"To unify the look" means to create a cohesive or consistent appearance by making all elements or parts of something blend well together. Full definition
Consider your neighbours when painting your front door — a more unified look along a street is generally thought of as more appealing. (idealhome.co.uk)
The «All contacts» and «Frequent» tabs have been given a refreshed, unified look instead of existing as tabs. (nashvillechatterclass.com)
The end result is an organized, unified look when corresponding with hiring managers or recruiters. (sterlingcareerconcepts.com)