https://www.studiograsshopper.ch/code-snippets/wordpress-list-all-image-sizes-in-media-uploader/#comment-239069
with reply:
https://www.studiograsshopper.ch/code-snippets/wordpress-list-all-image-sizes-in-media-uploader/#comment-239158

https://www.ads-software.com/plugins/image-size-selection/

Hello,

Found your pluggin but I’m struggling to use it. The drop down menu in Post > Images > Add Media window still displays the default three sizes plus full size.

I have entered these values into my functions.php file:

add_theme_support('post-thumbnails');
	add_image_size('slider', 960, 430, true);
	add_image_size('about', 210, 147, true);
	add_image_size('gallery', 161, 161);
	add_image_size('brokerage-thumbnail', 161, 147);
	add_image_size('brokerage-medium', 161, 161);
	add_image_size('brokerage-large', 530, 465);

add_filter('image_size_names_choose', 'my_custom_sizes');
function my_custom_sizes($sizes){
    return array_merge($sizes, array(
        'slider' => __('Sliding'),
        'about' => __('About'),
        'gallery' => __('Gallery'),
        'brokerage-thumbnail' => __('Brokerage'),
        'brokerage-medium' => __('Brokerage S'),
        'brokerage-large' => __('Brokerage L')
    ) );
}

I’m I doing correctly?

Regards,
Sam

https://www.ads-software.com/plugins/image-size-selection/

Activate. Then what?

https://www.ads-software.com/extend/plugins/image-size-selection/