Hey @rjbinney
Seems like “Featured Image” for post is not enabled. Here is how you can do it. But, before that please make sure the “Show featured image in the posts lists only, but hide it in the single post view.” under the Featured Image section on the Post editor is not ticked.
How to Disable Featured Image on Posts, Pages, or Other Post Types
- Log in to your WordPress dashboard.
- Navigate to Appearance > Customize.
- Within the Customizer, locate and click on the “Blog” section.
- Next, find and click on “Single Post” settings.
- Under the “Single Post” settings, you’ll see various customization options related to the layout and structure of individual blog posts.
- Look for the “Post Title Area” option and click on the arrow icon next to it to expand the settings.
- Within the “Post Title Area” settings, navigate to the “Structure” section.
- Here, you’ll find the option to enable or disable the display of featured images.
- To enable featured images, simply click on the eye icon next to the featured image option to toggle it on.
- After enabling the featured image option, preview your website to ensure that the changes have been applied as desired.
- Once satisfied with the modifications, click on the “Publish” button to save the changes and make them live on your website.
Just give us a shout if you need anything else, or you can wrap up the topic and mark it resolved
if you’re all set!