I added the JSON Beautifier extension for Opera for Mac, and when I view a page that outputs JSON, the "Pretty Print" header is displayed above the header for JSON Beautifier, so the controls are not available.

It did the same thing for every JSON viewer extension I could find.

I tried using opening Opera in Terminal with the flag to disable Pretty Print, but that did not work. This is the command:

open -a "Opera.app" --args --disable-blink-features=PrettyPrintJSONDocument

Is there another way to hide the header? Please help. Thank you.