Change the first submenu name of a menu in wordpress

The code adds a new parent menu item called “Auction Reports” in the WordPress admin dashboard. Each submenu links to a custom page in the admin dashboard where site owners can add relevant content or functionality.

// Function to add the custom plugin menu
function ts_actions_recent_bids_add_admin_page() {
    // Parent Menu: Auction Reports
    add_menu_page(
        'Auction Reports Page',     // Page title
        'Auction Reports',          // Menu title
        'manage_options',           // Capability
        'wc-auction-reports',       // Menu slug
        'ts_auction_reports_page',  // Parent menu callback function
        'dashicons-chart-area',     // Icon
        56                          // Position
    );

    // Submenu: Recent Bids
    add_submenu_page(
        'wc-auction-reports',        // Parent slug
        'Recent Bids Page',          // Page title
        'Recent Bids',               // Submenu title
        'manage_options',            // Capability
        'wc-auction-reports',        // Submenu slug (same as parent)
        'ts_actions_recent_bids_list' // Callback function
    );

    // Submenu: Customer Spending
    add_submenu_page(
        'wc-auction-reports',
        'Customer Spending Page',
        'Customer Spending',
        'manage_options',
        'wc-acutions-customers-spendings',
        'ts_acutions_customers_spendings_list'
    );

    // Submenu: Customer Bids
    add_submenu_page(
        'wc-auction-reports',
        'Customer Bids Page',
        'Customer Bids',
        'manage_options',
        'wc-acutions-customers-bids',
        'ts_acutions_customers_bids_list'
    );
}

add_action('admin_menu', 'ts_actions_recent_bids_add_admin_page');

// Parent menu callback function
function ts_auction_reports_page() {
    echo '<h1>Auction Reports</h1>';
    echo '<p>Welcome to the Auction Reports overview page.</p>';
}

// Submenu callback functions
function ts_actions_recent_bids_list() {
    echo '<h1>Recent Bids</h1>';
    echo '<p>Content for Recent Bids page.</p>';
}

function ts_acutions_customers_spendings_list() {
    echo '<h1>Customer Spending</h1>';
    echo '<p>Content for Customer Spending page.</p>';
}

function ts_acutions_customers_bids_list() {
    echo '<h1>Customer Bids</h1>';
    echo '<p>Content for Customer Bids page.</p>';
}