hide-menu-for-single-user.php

<?php
// add class to admin body tag
function add_body_classes( $classes ) {
	$current_user = wp_get_current_user();
 
 
    // Right: Add a leading space and a trailing space.
    $classes .= ' current-user-' . $current_user->ID . ' ';
 
    return $classes;
}
add_filter('admin_body_class', 'add_body_classes');

// add classes below to hide then. change number the the id of the user
function my_custom_fonts() {
  echo '<style> 
    .current-user-2 #menu-posts, 
    .current-user-2 #menu-comments, 
    .current-user-2 #menu-posts-brands, 
    .current-user-2 #menu-posts-brochure, 
    .current-user-2 #menu-posts-ranges, 
    .current-user-2 #toplevel_page_delete_all_posts, 
    .current-user-2 #toplevel_page_caldera-forms, 
    .current-user-2 #toplevel_page_wpforms-overview, 
    .current-user-2 #menu-appearance, 
    .current-user-2 #menu-plugins, 
    .current-user-2 #menu-users, 
    .current-user-2 #menu-tools, 
    .current-user-2 #menu-settings, 
    .current-user-2 #toplevel_page_edit-post_type-acf-field-group, 
    .current-user-2 #toplevel_page_meta-box, 
    .current-user-2 #toplevel_page_flow-flow, 
    .current-user-2 #toplevel_page_frasettings,
    .current-user-2 #toplevel_page_motopress-slider,
    .current-user-2 .wp-menu-separator,
    .current-user-2 #wp-admin-bar-updates,
    .current-user-2 #wp-admin-bar-comments,
    .current-user-2 #wp-admin-bar-new-content,
    .current-user-2 #wp-admin-bar-feed-imports,
    .current-user-2 #wp-admin-bar-imagify,
    .current-user-2 #wp-admin-bar-wp-rocket
	{
      display: none;
    } 
  </style>';
}
add_action('admin_head', 'my_custom_fonts');