Filters the “sizes” attribute string of the featured image

Default value:

sizes="(max-width: {{featured_image_max_display_width}}px) 100vw, {{featured_image_max_display_width}}px"

{{featured_image_max_display_width}} is the value set by the user in the settings.

Arguments:

• $sizes_format: string sizes attribute generated by the plugin
• $option: string value of the featured_image_max_display_width option

Note: this filter is only applied if the Featured image max display width option is set to a value greater than 0.

add_filter('safi_thumbnail_sizes_format ', function ($sizes_format, $option) {
    //Custom sizes attribute string
    $sizes_format = 'sizes="(max-width: 728px) 80vw, (max-width: 1000px) 100vw, 1000px"';

    return $sizes_format;
});