The generated UI does not match their brand. Where do we set that?

The demo UI came out in the default theme and the customer stopped listening. Can we match their brand without a front-end project?

Yes. [[product:ol-appiq|OL AppIQ]] themes are per application: CSS, a preview, a default, and image assets. Set the theme before you regenerate the screens you will show. The theme does not change the OpenAPI or the process. It changes how the generated UI looks.