Board Thread:Support Requests - Getting Technical/@comment-39313731-20190430222547/@comment-168424-20190430231243

You're not going to get anywhere using the Visual editing mode of the infobox editor... it is very, very limited.

Better to read up on the markup (Help:Infoboxes/editing, Help:Infoboxes/Tags) and use the Infobox source edit mode.