How enable or disable top bar?
Please go to WP Dasboard > Customize > Header and then select option: “Top bar visible” or “Top bar hidden” and save the changes.
If you selected “Top bar visible” then you can also set what to display in top bar. It could be one: “Secondary navigation”, “Social links” or “Search form”.
If you selected “Secondary navigation” then please make sure that you created menu in WP Dasboard > Appearance > Menus and assigned it to Top bar menu in WP Dasboard > Appearance > Customize > Menus > Menu Locations.