"A reminder from the Fifth Circuit: a shift transfer can be a materially adverse action for retaliation purposes. '[A] retaliatory shift change that places a substantial burden on the plaintiff, such as significant interference with outside responsibilities or drastically and objectively less desirable hours, can dissuade an employee from reporting discrimination.'"
See this link: https://www.employmentlawblog.info/2018/12/johnson-v-halstead-no-17-10223-5th-cir-dec-19-2018.shtml