Thanks for the report. You uncovered a bug. The bottom rail for upper doors was tied to the top rail for upper doors default. I fixed it as you can see in the attached. The disabling of the alignment slots does work as you can also see. Not sure what you may have been trying.
It appears that all four cabinets in your model have different construction methods, so I am assuming you are playing with default changes. I like that. It helps me to fix bugs. But some of the arrangements you have chosen I wouldn’t recommend using as a construction method in real life. For instance, you have selected to drawer the hinge plate holes in all four cabinets, but you have the sides set back. Those holes are likely useless as you will need to build out for hinges. But, I assume you don’t care, since you are just experimenting. Thanks again.