Add a simple button to the WordPress administrator toolbar that will remove the admin toolbar from the DOM.

functions.php

<?php

/* Click_Hide_Admin_Toolbar
 *
 *
 */


class Click_Hide_Admin_Toolbar {



    public function __construct(){
        $this->scripts();
        $this->styles();
        add_action( 'admin_bar_menu', [ $this, 'chat_button' ], 999 );
    }



    public function chat_button( $admin_bar ){
        $admin_bar->add_menu( array(
            'id'    => 'chat-button',
            'title' => 'Hide',
            'href'  => '#',
            'meta'  => array(
                'title' => __('Click to hide the admin toolbar. Toolbar will reappear on refresh.'),
                'onclick' => __('click_hide_admin_toolbar_nth_patent(this, 4).remove();'),
            ),
        ));
    }



    public function scripts() {
        ob_start(); ?>
        function click_hide_admin_toolbar_nth_patent(element, n) {
            while( n-- && element )
                element = element.parentNode;
            return element;
        }
        <?php $chat_scripts = ob_get_clean();
        if ( ! wp_script_is( 'chat_scripts', 'enqueued' ) ) {
            wp_register_script( 'chat_scripts', $script_uri, array(), '1.0.0' );
            wp_enqueue_script( 'chat_scripts' );
        }
        wp_add_inline_script( 'chat_scripts', $chat_scripts );
    }



    public function styles() {
        ob_start(); ?>
        li#wp-admin-bar-chat-button a {
            border-width: 0px 1px 0px 1px;
            border-color: #f0f0f180;
            border-style: solid;
        }
        li#wp-admin-bar-chat-button a:hover {
            border-width: 0px 1px 0px 1px;
            border-color: #FFFFFF;
            border-style: solid;
            color: #FFFFFF;
        }
        <?php $chat_styles = ob_get_clean();
        if ( ! wp_style_is( 'chat_styles', 'enqueued' ) ) {
            wp_register_style( 'chat_styles', FALSE );
            wp_enqueue_style( 'chat_styles' );
        }
        wp_add_inline_style( 'chat_styles', $chat_styles );
    }



} // close the Class




/* Call the Class
 *
 *
 */

add_action('wp_head', 'chat_activate');
function chat_activate(){

    new Click_Hide_Admin_Toolbar();

}





?>