Change columns order on mobile (col-xx-push-x)

Hello,

I would like to change the order of my columns on mobile device but adding the classes col-xx-push-x & col-xx-pull-x in the “Extra Class Name” of the column doesn’t seem to work. How could I get this right please?

What I would like to get:
lg screen:
[columnA] [columnB]

sm screen:
[columnB]
[columnA]

Thanks in advance,

Jonathan

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