I've got an ultrawide screen, and typically split it into thirds to have multiple windows open at once.  This means my browser window is about 1120px wide.  The top nav bar does not properly adapt to various sizes below full screen at 1080p.

Window at 1120px:

Note: when horizontally scrolling, the nav bar's background doesn't extend past the original width of the window, making it impossible to see the additional menu items.

When shrinking the window further, the menu collapses, but doesn't work properly.

Menu closed:

Menu open:

Note that the menu doesn't display, and instead there's just some red characters overlayed that are not clickable.

Additionally, when on pages with the new Vue UI, the top nav bar does not scroll to the side, preventing access to any items that have overflown.