remove-hidden-group-profile-link.php

<?php
add_filter(
	'wp_nav_menu_objects',
	function( $items ) {
		if ( get_current_blog_id() === cboxol_get_main_site_id() ) {
			return $items;
		}

		$group_id = openlab_get_group_id_by_blog_id( get_current_blog_id() );
		if ( ! $group_id ) {
			return $items;
		}

		$group = groups_get_group( $group_id );
		if ( 'hidden' !== $group->status ) {
			return $items;
		}

		if ( is_user_logged_in() ) {
			$user_id = get_current_user_id();

			$user_has_access = current_user_can( 'bp_moderate' ) || groups_is_user_member( $user_id, $group_id ) || groups_is_user_mod( $user_id, $group_id ) || groups_is_user_admin( $user_id, $group_id );
		} else {
			$user_has_access = false;
		}

		if ( ! $user_has_access ) {
			$items = array_filter(
				$items,
				function( $item ) {
					return 'group-profile-link' !== $item->slug;
				}
			);
		}

		return $items;
	},
	20
);