It seems that with every update to Google Chromecast they change the html that hides the hidden settings. Try searching the code for the word hide and commenting this out. Alternatively search for a word that’s displayed only in the hidden settings and find out how it’s being hidden.
Let me know how you get on (please share the latest setting with the forum 🙂 ), and if you’re still struggling I’ll see if I can find it for you.