I’m trying to apply a class that would make two columns even height. It works great, but I would like to remove this class from MD and SM device sizes only. It messes up the page when the two columns are not side by side.
When I try to remove it while in the corresponding size, the class is removed from ALL classes. How do I solve this?
You can edit the classes in your other breakpoints to delete the relevant settings, but keeping the classes there.
You can’t, you apply the values in the class to one device size.
Remember styling cascades down 
I accidentally added the same class to row and that is what was causing issues. Everything is working great now. Thank you both!