Disable WordPress Admin Bar

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You can disable it by use this function in functions.php in child theme:

// DISABLE WORDPRESS ADMIN EXCLUDE ADMIN USER
​add_action('after_setup_theme', 'remove_admin_bar');

function remove_admin_bar() {
if (!current_user_can('administrator') && !is_admin()) {
  show_admin_bar(false);
}
}

Code from WPBeginner.

​Or you can try use third party plugin: https://wordpress.org/plugins/hide-admin-bar/.