I'm using Nintex Forms for O365 (App Version: NFO 18.104.22.168) and was trying to set up a tabbed interface using the Choice control's Display Format = Option Buttons (See my screenshot of the Control Settings, below). This is a really cool built-in feature based on this video, however it looks like on-prem SharePoint therein: Create Tab like functionality on your Nintex Forms.
So here's the problem -- the buttons are NOT rendering in O365, rather it just looks like a typical radio button field. Is there a workaround to this? Custom CSS or anything? I'm new to Nintex so I may have missed a step, so if there's a video out there specific to O365, that would be helpful as well.