When you use some blocks such products, collections, blogs,… the app will take the data of your Shopify store to display on the menu.
However, when you make changes in the Shopify admin page, please go back to the app to republish the menu in order for the app to update changes and show out on the front end.
Note: The app doesn’t yet have the function to update changes from the Shopify admin page to the menu itself.