Same issue here as well. Tried even hiding the modal by using Dev Tools in Chrome, but as soon as I click another text box the "highlight feature pop-up" comes right back. Super frustrating. Can't edit any text on a website that's launching January 1st. Hopefully there's a fix soon.
EDIT: My site started working again - I didn't change anything or do anything differently, just reloaded the page and it started working. Maybe they're working on a fix?