It sounds like the Featured Image box might be hidden in the screen options of your listing edit page. To check and enable it again, follow these steps:
- Go to your listing edit page in the backend.
- Look for the ‘Screen Options’ button at the top right corner of the screen.
- Click on ‘Screen Options’, and a dropdown menu will appear with various checkboxes.
- Find the checkbox for ‘Featured Image’ and make sure it is checked.
- Once checked, the Featured Image box should reappear on the edit screen.
If the ‘Featured Image’ option isn’t listed under Screen Options, it could be a theme or plugin conflict preventing it from displaying. Try disabling plugins one by one to identify if any are causing the issue, or switch briefly to a default WordPress theme to rule out a theme conflict. I also solve this problem with my website, you can see live here for further clarification.
Hope that helps!