Admin Dashboard “Visit Site” menu issue

Whenever you view your profile from the admin panel ( Users -> Your Profile ) there’s a checkbox for “Show Toolbar when viewing site” that needs to be checked. Additionally, a theme or plugin could be manually hiding/removing the admin toolbar from the front-end. You can install something like the WordPress Health Check & Troubleshooting Plugin to safely disable plugins and themes until you find out which plugin or theme is hiding the admin toolbar.

I would install the plugin linked above and giving this section a read-through. It’s a really neat and useful plugin – should help you quickly narrow down what’s causing it:

https://make.wordpress.org/support/handbook/appendix/troubleshooting-using-the-health-check/#troubleshooting