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<?php
add_filter( 'wp_nav_menu_objects', function ( $menu_items, $args ) {
	if ( $args->theme_location !== 'menu-1' ) {
		return $menu_items;
	}

	static $average_cnt = null;
	static $items = [];

	if ( $average_cnt === null ) {
		$average_cnt = ceil( count( array_filter( $menu_items, function ( $item ) {
				return ! $item->menu_item_parent;
			} ) ) / 2 );

		$cnt = 1;
		foreach ( $menu_items as $i => $item ) {
			if ( $average_cnt >= $cnt ) {
				if ( ! $item->menu_item_parent ) {
					++ $cnt;
				}
				$items['left'][ $i ] = $item;
			} else {
				$items['right'][ $i ] = $item;
			}
		}
	}

	return $items[ $args->side ];
}, 10, 2 );

wp_nav_menu( [
	'theme_location' => 'menu-1',
	'menu_id'        => 'primary-menu',
	'side'           => 'left',
] );

echo "\n---- ЛОГО -----\n";

wp_nav_menu( [
	'theme_location' => 'menu-1',
	'menu_id'        => 'primary-menu',
	'side'           => 'right',
] );
?>