Pages in multiple categories -> active menu item

Hi,

My menu looks like this: home, projects, blog, about ...

if i create a new page under projects it should also appear in blog.
This already works using collections in my blog

YAMLCopy

    content:
    items:
        - s[email protected]
        - taxonomy@:
                category: project

i use Route Overrides - Route Aliases
so e.g. in "/projects/example_project/item.md" i have "blog/example_project" as Route Alias,
so both urls

/projects/example_project

and

/blog/example_project

work.

now finally to my question:
Depending on which url i use (or how i reached the page) i want ether menu item"projects" or "blog" to be active...

i thied modifiing navigation.html.twig, but i guess thats not the right way(?)
i serched the forums but couldn't find the answer

Thanks in advance!

I think modifying navigation.html.twig is the right way. However such modification cause difficulty when the theme is updated and without caution you loose your modifications.

A solution is to use theme inheritance. In 2014 rhukster has written a blog post about theme inheritance.

I hope this helps.