This isn’t clean and I have no idea why this is behaving this way but . . . this is a way around it.
Sometimes Gravity Forms won’t let me choose the “Use the Rich Text Editor” option but I really, really want to choose that option. It’s grayed out as you can see below.
In Chrome, I click “inspect element” on the grayed out checkbox and I can then see in the HTML that the word “disabled” is just sitting right there taunting me.
What’s nice is I have the power to destroy that word. If I click on it and erase it things become good again and the checkbox is now available.
And victory! I haven’t seen any ill effects for doing this and I’m not sure why it’s happening but this a way around it.