Can't get full width nav menu to work

Ok so I guess this is my final attempt / last resort. I tried the Discord, I tried the Facebook group and now I’m here.

This is what I want to create:

I put the nav links in a block so I could display them vertically. In the builder itself it looks like it is working but if I go to the frontend the image is rendered outside of the menu on the page itself, instead of in the (opened full width) menu. You can see the problem here:

The strange thing is that if I move the dropdown element outside of the block it does work… but I kind of need that dropdown element. Any have a solution here? Is it even possible what I want to make?