Consider removing auto-collapsing behaviour of global nav groups

[thupsi]

From an a11y and UX perspective the auto-collapsing behaviour of global nav groups (meaning that nav groups collapse when selecting an item outside the group), has some considerable drawbacks:

• Increases cognitive load by forcing users to remember where items are located.
• Users with cognitive disabilities may struggle with interface elements that change without direct user action.
• Motor impairment users might find it frustrating to repeatedly expand sections they need.
• It removes control from users that want to have the navigation groups in a certain state.
• Interrupts workflow if users frequently need to reference items from multiple sections.

I became especially aware of the above shortcomings while testing the new "Content Section" functionality, but realised that this is more of a global issue.

The only argument in favour of the current behaviour (that I can think of) is saving space and reducing visual clutter. But, IMO, since we have the option to manually expand/collapse groups, that shouldn't be an issue.