The user interface of current editor for text fields is confusing. It shows a plus icon, and there is no obvious styling options (boldface, italics, etc.) unless you highlight some some text. It will be great if you would consider switching to a different text editor.
Welcome to the miniExtensions forum. We have an existing ticket for this concern. I have forwarded your +1 to the team to see if we can prioritize this. Thank you for your feedback and let us know if you have any other concerns.