WPFC isn’t responsible for styling those directory views. Your server / host config does that. (At the bottom you can see it’s generated by LiteSpeed in your case)
https://www.litespeedtech.com/docs/webserver/config/general#autoIndex
The best solution is to deny access to all views like this, because there is usually no good reason to allow it. It can also be disabled for individual folders, but I recommend disabling it everywhere. Search Console will report the same error/warning if it finds another directory.
Another solution (not recommended) is to make sure you have an index file in those directories (index.html or index.php usually). The index file will be displayed instead of the directory view.
if you are sure that all the images have been optimized properly, you can remove the /wp-content/uploads/wpfc-backup/ folder successfully.
I remove the folder. Thanks @emrevona Başarılar…
