Remove / Disable default custom.css?ver=1.0.0

Here’s how you could use the wp_dequeue_style function in a WordPress hook to unenqueue the custom-css stylesheet:

function wpsx411806_unenqueue_custom_css() {
    wp_dequeue_style( 'custom-css' );
}
add_action( 'wp_enqueue_scripts', 'wpsx411806_unenqueue_custom_css' );

In this example, the wpsx411806_unenqueue_custom_css function uses the wp_dequeue_style function to unenqueue the custom-css stylesheet. The function is then registered as a callback for the wp_enqueue_scripts hook.