config.js to make them live for everyone.
This panel is for the site owner. Nothing here changes what visitors see — it only previews settings in your own browser — but it’s hidden so it doesn’t clutter the site.
Everything here needs your input. Type into a field and the site behind this panel updates straight away so you can check it. When it looks right, press Copy config and paste the block over the const CONFIG = … line in the HTML file — that's what makes it real for visitors.