documentation for Column Helper control

I have searched and searched, but only find a mention of it in the documentation.<br /> To use it, you "give it the correct Responsive Display class".<br /> What is the correct Responsive Display class???? I can make it break row (all the time) or select "clear fix", not sure what clear fix does.

Steve

To force columns to break to next line

Bootstrap v4 https://getbootstrap.com/docs/4.3/layout/grid/#column-breaks

Bootstrap v3 https://getbootstrap.com/docs/3.4/css/#helper-classes-clearfix

Saj