Yup... just edit [ Interface > AddOns > nUI > Layouts > Default > nUI_Layout_Default_Dashboard.lua ] and locate the section for the action bars... just change the values of rows = 1 to rows = 4 and cols = 12 to cols = 4 for each action bar you want to modify and save, then do a '/nui rl' to see the results.
You can use '/nui movers' to unlock the action bars so you can drag them to new positions, as well.
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