Define filters

Filters that appear for the post type listing admin screen can be defined using the filters() method.

This must return an array of taxonomy slugs that are to be used as dropdown filters for the post type.

By default, an empty array is returned.

use PostTypes\PostType;

class Books extends PostType
{
    //...

    /**
     * Returns the filters for the Books post type.
     *
     * @return array
     */
    public function filters(): array
    {
        return [
            'category',
        ];
    }
}