Customize tinyMCE job description editor

Hey,

we would like to customize the tinyMCE for job description:

– give the editor more height
– add options for h1, h2, h3 elements

We already found that code, but it does not work e.g. adding with “h1”:

add_filter( 'submit_job_form_wp_editor_args', 'customize_editor_toolbar' );
function customize_editor_toolbar( $args ) {
	$args['tinymce']['toolbar1'] = 'bold,italic,alignleft,aligncenter,alignright,|,bullist,numlist,|,undo,redo';
	return $args;
}

How can we do this?