How to apply Experimental Code Editor Theme?

I’ve enabled Experimental Feature and then selected theme from Experimental Option but no changes to my Codeview theme? Anything that I might’ve missed?

The color themes are for the new Monaco Editor, which is not yet available for HTML and PHP files.
You can check the new editor by editing css/js files in Wappler.

On your screenshot I see the standard editor, where these themes do not apply.