The button is currently located in the upper right corner of the page. Looks like, this behavior has been introduced recently, I guess, at least I didn't notice it before.

To match with consistency of the console log, it would be better to move the button to the sidebar as subtask of the  "Polling Log" button, instead of having it floating around the page, I guess.

Console log with "View as plain text" (looks good below the Console output and indented)

Polling log "View as plain text" (looks wrong on the far right)