Thank you for the fast response. I accepted the fact that in fact I don’t need thumbnails on the site at all. Understood with the generation of various miniatures. You have a great plugin that shows relevant results and does not slow down the site. Can I use a simple list without showing thumbnails? I don't know how to achieve this. If it is possible to do so please tell me how to do it.
----
To disable the generation of all thumbnails, I added the following code to the function.php of the theme:
/*Disable thumbnails generation in WordPress/
function vel_remove_all_image_size($size) {
unset($size['thumbnail']);
unset($size['medium']);
unset($size['medium_large']);
unset($size['large']);
unset($size['1536x1536']);
unset($size['2048x2048']);
unset($size['thumb-small']);
unset($size['thumb-standard']);
unset($size['thumb-medium']);
unset($size['thumb-large']);
unset($size['thumb-xlarge']);
unset($size['thumb-xxlarge']);
}
add_filter('intermediate_image_sizes_advanced', 'vel_remove_all_image');