Post comment forms are not the easiest to customize. Thankfully, GeneratePress provides a few functions to facilitate the process.

Resize author comment avatar

The following snippet will increase the size of the author comment avatar:

add_filter( 'generate_comment_avatar_size', function() {
    return 100; // The size in pixels. This would be 100 x 100.
} );

Rename comment title

The following snippet will rename the comment title from [comment count] thoughts on... to Comments (see next screenshot):

add_filter( 'generate_comment_form_title', function() {
    return 'Comments';
} );

Add content below comment title

This snippet will add content below the post title:

add_action( 'generate_below_comments_title','generate_comments_email_message' );
function generate_comments_email_message()
{
	
    ?>
    <p class="total-comments">Total Comments: (  <?php comments_popup_link( __( 'Leave a comment', 'generatepress' ), __( '1', 'generatepress' ), __( '%', 'generatepress' ) ); ?> ) </p>
    <?php
}

Add placeholder text in comment textarea field

This snippet will add a placeholder text in comment textarea field (see next screenshot):

 function placeholder_comment_form_field($fields) {
    $replace_comment = __('Comment *', 'generatepress');
     
    $fields['comment_field'] = '<p class="comment-form-comment"><label for="comment">' . _x( 'Comment', 'noun' ) .
    '</label><textarea id="comment" name="comment" cols="45" rows="8" placeholder="'.$replace_comment.'" aria-required="true"></textarea></p>';
    
    return $fields;
 }

add_filter( 'comment_form_defaults', 'placeholder_comment_form_field', 20 );

Add text after Leave Comment title

This snippet will insert content after the Leave Comment title:

add_filter('comment_form_defaults', 'change_note_after_comment_form',99);
function change_note_after_comment_form($defaults) {
	$defaults['comment_notes_before'] = '<p class="comment-notes"> Your email address will not be published. Required fields are marked* </p>';
	return $defaults;
}

Alternatively, create a block element, assign it to appear to all single posts, select Hook as ELEMENT TYPE, Custom Hook as HOOK NAME and enter comment_form_top as CUSTOM HOOK NAME. Then build your block that should appear underneath the Leave Comment title.

Add comment URL label without removing the placeholder

This snippet will add a URL label without removing the placeholder:

add_filter( 'comment_form_default_fields', function( $fields ) {
    $commenter = wp_get_current_commenter();

    $fields['url'] = sprintf(
        '<label for="url">%1$s</label><input placeholder="%1$s" id="url" name="url" type="url" value="%2$s" size="30" />',
        esc_html__( 'Website', 'generatepress' ),
        esc_attr( $commenter['comment_author_url'] )
    );

    return $fields;
}, 20 );

That’s all for now, I will updating this post with new related code snippets in the future!

Remove E-mail and URL field from Comment Form

If you would like to remove e-mail and URL field from comment form, first uncheck the requirement in Settings > Discussion:

Then add the PHP snippet below to remove the fields

add_action( 'after_setup_theme', 'tu_add_comment_url_filter' );
function tu_add_comment_url_filter() {
    add_filter( 'comment_form_default_fields', 'tu_disable_comment_url', 20 );
}

function tu_disable_comment_url($fields) {
    unset($fields['url']);
    unset($fields['email']);
    return $fields;
}

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Adding CSS

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