Google mobile friendly web page

Hello
I just installed your plugin and it seems that everything works fine,the problem is that every time I am running the option offered by Google’s quick mobile-friendly test tool, shows me red bar with the text “Not mobile-friendly”. Is there a way that this plugin can make my page be a mobile-friendly and pass the google test. Also wanted to know if it is necessary to insert this code: <?php echo do_shortcode(‘[show_theme_switch_link]’); ?>
in my template to make the plugin work. Thanks for your help.
Best regards