With 4.1, sequential mode is not working. I created four models, assigned one to each of four processes, select sequential mode with 2mm clearance, and the preview still displays the layers being printed one at a time.
https://imgur.com/fzHH1yo
https://imgur.com/uozTghW
https://imgur.com/UiGXzSy
I really wish sequential printing was a simple checkbox for multiple identical parts. I lay out a bed with 150 parts and I have to manually create 150 processes. Slight design change in the STL and I have to redo the entire procedure. Not practical for production.