Code-Snippets-Functions/Execute a function on a child site/WordPress/change-the-default-value-of-the-heading-block.txt

function define_editor_heading_levels( $args, $block_type ) {
    if ( 'core/heading' !== $block_type ) {
        return $args;
    }

    // Change default heading level value to 3
    $args['attributes']['level']['default'] = 3;

    // Keep only H3 level 3 option
    $args['attributes']['levelOptions']['default'] = [ 3 ];
    
    return $args;
}
add_filter( 'register_block_type_args', 'define_editor_heading_levels', 10, 2 );