My Dashboard style is broken

In your functions.php page you will want to use this to register your .less file:

//Register Styles
	function theme_enqueue_styles() {
	    wp_enqueue_style('theme-main', get_stylesheet_directory_uri().'/style.less');
	}
	if ( ! is_admin() ) {
	add_action('init', 'theme_enqueue_styles');
	}

This way you’re only adding it to the front end and not the admin.