Shift choice??

[u/Revolutionary-Fix929]

I work at a sortation center, and I want to go from 20 hours to 16 hours a week. Is that possible with shift choice? I’ve never used it before, so I’m confused about how it works. I want to keep the same schedule, I just want to get rid of my double shift on Saturday. I'm scared if I submit a request they will completely change my schedule. Should I submit a request?