“Flat color / Theme artwork” toggle

Step by step

1. On the Create club form, in step 3, find “Hero background.”
2. Click Flat color to show your banner as a plain color.
3. Or click Theme artwork to show the selected theme’s landscape or indoor-range image instead.

Theme artwork stays disabled (greyed out) until you’ve picked a theme card further up the page — pick one first if you want to use it.