The way that the tooltip you're seeing should work is:
Make sure you have Title Attributes enabled for the menus in the customizer by clicking the settings icon in the top right of the Menus section, and selecting the checkbox for Title Attribute:
When you go to edit your menu items, you should see the Title Attribute field displayed. Whatever you enter in this field is what should be added to the link's title attribute, which is the tooltip that you're referring to popping up. This for example adds "Something Here" on hover of the Home menu item in my primary menu.
Leaving the Title Attribute field empty, the tooltip you're referring to will no longer be displayed since the title attribute isn't applied to the nav menu item link:
Josh I'd also like to say thanks for using BoldGrid! Not just using it, but also taking time from your day to let us know about the feature you found lacking in your experience while using it. We really appreciate you providing your insight and suggestions for features to help make BoldGrid even better for everyone!
Hey Josh Cohen,
I wanted to let you know that we received your request for adding this feature to BoldGrid Theme Framework v1 based themes. The full details of the issue and the solutions are available in our GitHub issues. If you're in need of this feature before an update gets pushed out, I've packaged the code into a plugin, which can be installed and activated in your WordPress Dashboard:
Direct Download:
bgtfw-allow-nav-menu-link-title-attributes.zip
The way that the tooltip you're seeing should work is:
Josh I'd also like to say thanks for using BoldGrid! Not just using it, but also taking time from your day to let us know about the feature you found lacking in your experience while using it. We really appreciate you providing your insight and suggestions for features to help make BoldGrid even better for everyone!
- tim