Menubar Dropdown keyboard navigation

Apologies if this is written down in the docs, I did not manage to find it!

Currently, if I add something like the code below, the individual dropdowns are unaware of each other through keyboard navigation. If I am focused on an item within the first Dropdown menu and I hit the left/right arrow key, focus should be moved to the second dropdown. Does SLDS provide a wrapper component that handles this sort of keyboard navigation?

<nav>
    <SLDSDropdown><Trigger /></SLDSDropdown>
    <SLDSDropdown><Trigger /></SLDSDropdown>
</nav>

Here is an example of what I am looking for. Using a keyboard, I can focus on the "About" menu. Using the down arrow opens the menu and focuses the "Overview" item. If I then hit the right arrow key, the next dropdown in the menubar is focused.

Start by reviewing the SLDSDropdown component and the linked WAI-ARIA menubar example to compare the requested keyboard behavior. Done means adjacent dropdowns can transfer focus with the left and right arrow keys, while opening a menu and moving to its items follows the described interaction.