Menu Section flexibility

Hi i use wordpress more than 15 years, there is any solution or anyone he never thought to keep simple the way of menu adding? Example when you have a website with a lot of menu and submenus there is huge problem to manage or remember if all categories are in use. So an easy way is if there is any way to highlight or bold the items are in use to the current menu. A second idea is to make it more flexible the items section so ca appear more items to add in menu