Demote Yoast’s meta box priority to ‘low’

The Yoast meta box sits just below the main editor. To demote it, aka, reduce its priority, just add this anonymous function to your theme (or better still, a custom plugin):

add_filter( 'wpseo_metabox_prio', '__return_false' );

Or, you can use the more commonly quoted approach of explicitly stating the meta box’s positional priority to ‘low’:

add_filter( 'wpseo_metabox_prio', 'filter_wpseo_metabox_prio' );
function filter_wpseo_metabox_prio() {
    return 'low';
});

With namespace:

add_filter( 'wpseo_metabox_prio', __NAMESPACE__.'\\filter_wpseo_metabox_prio' );
function filter_wpseo_metabox_prio() {
    return 'low';
}

And if you’re a fan of one-liners set the priority with an anonymous function:

add_filter( 'wpseo_metabox_prio', function() {return 'low';} );