Show first level album thumbnails in categories

[nowordneeded]

I'm running the current stable version of 1.6.23 and the gallery is https://bellaramsey.org

The problem I'm having is that I can't get the Show first level album thumbnails in categories to nest the categories inside the main category. It's a new install and upgrade to the latest verison, and I'm a bit perplexed cause when I've unticked this in the other installations it's nested properly as it does in this gallery https://temueramorrison.org/gallery that has been updated to the latest version of 1.6.23. The Show first level album thumbnails in categories has been unticked in this gallery.

NWN

[nowordneeded]

Gallery for the Bella Ramsey site is https://bellaramsey.org/gallery. Would have edited the original post, but there's now edit option.

[nowordneeded]

Found the issue. I forgot to set Number of levels of categories to display to 1. Don't know why I missed that.

Closing topic now.