Adding a button to menu. Workaround?

This will do that, no need for the PHP: https://generatepress.com/forums/topic/targeting-a-single-navigation-menu-item-to-create-a-button/page/2/#post-268607

But I am trying to add an image button, not a text button.

How to add image-button into the menu?

You could try something like this: https://en-ca.wordpress.org/plugins/menu-image/

Hi Tom,
With this hook I have created a div with a phone number, in the desktop menu, which works great. But I would like to add the same div to the mobile menu, between the (left) logo and (right) toggle button. I this possible with a function?

Thanks!

This hook might be useful: https://docs.generatepress.com/article/generate_inside_mobile_menu_bar/

Otherwise, generate_inside_navigation should work for mobile as well.