Hello @Marisa_M ,
This is going to be a default functionality to add another section at the bottom of the email. I'm able to still click in the area of the text that's slightly obscured by it, and insert / highlight text, and I'm able to click outside of the editor to get it to go away so I can see everything clearly. Once I start working in the editor again, that tab will display as expected.
If you're finding it somehow preventing you from working within the text block, I'd advise adding a spacer block or something there for the time being, then removing that when you're done with that text block at the very bottom of the email.