how to create the back option on detail project page

Hi
I am using Illdy theme which is one of the best theme i found for small businesses
I also tried connecting the project images to individual project pages (created new pages in WP and connect those) and after deactivating the fancybox 3 plugin it is going to those pages as well. but now i m facing project as when i click on the top menu bar links the page in not going back to the main site as the link shows #projects or #about-us and not going back

Please can you advice on how to create a back option or how to get the url for those menu item which are created as widgets i think

thanks

hey there

Try to use full urls in the menu links http://siteurl.com/#projects