How to get uniformly customized navigation

Dear experts,

I have three main navigation links – overview (hidden on the homepage), projects (with a submenu) and info.
Depending from where I open the submenu this one looks different – which I don’t want.
It looks like all links/pages from the folder projects are considered active at the same time.

Please check this short video: https://www.loom.com/share/8f42364921a54f53a99005eafb0f66e1, where I switched several times between the two dropdown menu versions, so that it’s clear what I mean.
Please check also the png attached for better comprehension.

URL is:
www.dg-artwork.de or https://aqua-fox-hw4m.squarespace.com
Password: dga2023

Thank you very much in advance for your help

Best regards.

D*

Do you still need help?

Dear Tuan,

yes and no. I have the feeling there is no solution for that.

But in case you have one, I would be delighted, of course.

many thanks!

D*