[mariosipad]

Herewith an abbreviated example on how it should work (in this case not using .htaccess authentication):

A - config_local.php (all libraries and COPS user)

<?php
    if (!isset($config))
        $config = array();

    $config['calibre_directory'] = array (
    "01 - Repository Information" => "/share/CACHEDEV1_DATA/Backups/Calibre_Libraries/01-Repository Information/",
    "02 - Fiction eBooks" => "/share/CACHEDEV1_DATA/Backups/Calibre_Libraries/02-Fiction/",
    "03 - NonFiction eBooks" => "/share/CACHEDEV1_DATA/Backups/Calibre_Libraries/03-NonFiction/",
    "04 - Science Fiction eBooks" => "/share/CACHEDEV1_DATA/Backups/Calibre_Libraries/04-Science Fiction/");
    
    /*
     * Catalog's title
     */
    $config['cops_title_default'] = "COPS 1.1.1";
    
    $config['cops_use_url_rewriting'] = "0";

    $config['default_timezone'] = "America/Phoenix";

    $config['cops_basic_authentication'] = array('username' => 'cops', 'password' => 'secretpw');

B - config_local.monty.php (all libraries and user MONTY)

<?php

    /*
     * Catalog's title
     */
    $config['cops_title_default'] = "MONTY COPS";
    
    $config['cops_basic_authentication'] = array('username' => 'monty', 'password' => 'mypwd');

C - config_local.user2.php (limited access to libraries and user USER2)

<?php
    if (!isset($config))
        $config = array();

    $config['calibre_directory'] = array (
    "01 - Repository Information" => "/share/CACHEDEV1_DATA/Backups/Calibre_Libraries/01-Repository Information/",
    "03 - NonFiction eBooks" => "/share/CACHEDEV1_DATA/Backups/Calibre_Libraries/03-NonFiction/");
    
    /*
     * Catalog's title
     */
    $config['cops_title_default'] = "USER2 COPS";

    $config['cops_basic_authentication'] = array('username' => 'user2', 'password' => 'user2pwd');

PS: I'm in Europe (Netherlands) and you are in Arizona. Some time delay in answering your posts is inevitable.