Disable the WordPress Admin Bar for all Users and Visitors
Turn off the toolbar with one simple line…

Without Plugin

Just input this code in your functions.php page on your active theme folder.

/*
* Disable the WordPress Admin Bar for all Users and Visitors
*/
remove_action( 'init', '_wp_admin_bar_init' );

Use Plugin

If you want to the work using plugin, then you can download this plugin wp admin bar hiddener tools plugin this plugin available WordPress.org official site. you can download this below link.

Download wp admin bar hiddener tools plugin

Admin Bar hide, WordPress admin bar hide using plugin, WordPress admin bar tutorial,  how to hide admin bar in WordPress without plugins, how to hide admin bar only coding in WordPress.