[Solved] Please make comment field not required

@jave,

Please follow the steps below: 

1. Put the code below in the WordPress active theme functions.php file:

add_filter('comment_class',function($classes, $css_class, $comment_ID, $comment){
    if($comment->comment_content == ''){
        $classes[] = 'empty-comment';
    }
    return $classes;
},15,4);

The code adds the empty-comment class to each comment without any content. 

BTW: you can change the empty-comment class name as you like. 

This article should be helpful for you: https://www.wpbeginner.com/plugins/how-to-easily-add-custom-code-in-wordpress-without-breaking-your-site/

2. Hide the div with empty-comment class using this CSS code: 

#wpdcom .empty-comment {
    display: none;
}

Put the code in the Top Admin Bar > Customize > Additional CSS > "Additional CSS" textarea, save it, delete all caches and check again.

3. Another point you can use the hook code below if you face the issue with the duplicate comment:

add_filter('duplicate_comment_id', '__return_false');

It also should be added in WordPress active theme functions.php file.