BS scales to fit

I have a model on MW that relates to the size of pennies. The model can’t be scale and work.

It is too big to fit on an A1mini. MW scale it to fit, and gives no clues. If you select the object it says it is 200mm long, But the build size is 180. If you scale it is showing 100%. but it is smaller than the build volume.
I didn’t expect MW to scale to fit. If I change the printer to A1mini in BS, it does not scale. If I select the printer on MW and open in BS it is scaled.
I see no way to define unprintable on A1. Am I missing something?

I wish I knew when it would scale and when not.
It appears opening from MW with the A1 selected scales. It shows is as fitting on the bed. And with the part selected it gives the size as 200mm that obviously does not fit on the 180 bed.
It appears to work fine switching to the downloading from MW for a x1c then switching works as expected.
I don’t have an A1. Just trying to understand.
I understand why MW would want to scale to fit items close to work. But for some things that is the wrong answer.