Force FormLayout to use single narrow vertical set of fields

I have a few cases where FormLayout is taking fields and spreading them across 2 vertical columns, but I want to force everything in the FormLayout to be in a single narrow vertical.

The attachment form-wide shows what FormLayout currently does. I want to get the behavior shown in form-narrow.jpg no matter how much screen space is available. How do I do this?

Using Vaadin Flow 14.2.0


 formLayout.setResponsiveSteps(new FormLayout.ResponsiveStep("25em", 1));

Yes! That did exactly what I wanted!

Thank you so much!