Disable "Source" view in Profile "About" section

[+51MarLin 14]

I was in my Profile edit page and I was changing the info in my About section. I clicked on the green Source button and it changed to HTML/Rich Text Editor. How do I go back to the old, plain text form?

Edited November 23, 2020 by 51MarLin
clarification

[+TriciaG 576]

Click the green Source button again. It's a toggle button between the two options.

Edited November 23, 2020 by TriciaG