[ ] Add "Quick Access" section
[ ] Make the header / title collapsible
option 1 and option 2

@xPoppyx That's an interesting take-having the drives go under This device.
Originally, I was proposing something like this, with three sections:

(Ignore the new tab page stuff for now)
It looks great, maybe with an option to choose the order? for example first "pinned items", then "This device" and "Drives"
I don't know how hard it would be but ideally it should be possible to rearrange the items in the sidebar. Additionally, the home page shouldn't prevent improving the sidebar.
concept updated
I would have sections for
These would use the new Heirachical NavigationView.
I would also like to see an option to display a TreeView for folder navigation within a tab, maybe using a separator to resize that and the Icon/Detail view.
@mdtauk There are native apps for iCloud and Dropbox. We can pin their folders if the native client is installed on the device.
@duke7553 I took the liberty to modify your idea to propose a slightly different version.

Idea

Proposed
The sidebar looks streamlined and the blue marking is not floating far from the left edge. (like in the current design, which is good) (important for quickly identifying which folder the user is currently in) After a while, the user forms a mental model of what group is where and they only search for the actual folder or drive. Pushing it into the right to make it a subgroup is in my opinion unnecessary.
I feel having an icon in the sections is also redundant because, for example, the drives section doesn't need a drive icon when all its children have the drive icon. It adds to visual complexity and most of the time the headers are not the main thing the user is looking at. Its the actual drives and folders instead.
Instead of subgrouping like a tree, increasing the spacing between sections improves the grouping a bit better; the extra space can be removed when the sections are minimized (as can be seen in the dummy section). Maybe the actual spacing can be tweaked to make it a little denser to fit more.
Option 2

I like the idea of having a bit more separation like the previous concept, with either padded nesting for each header or space between headers. I think it makes a potential long list cleaner/easier to navigate.
Regardless, we'll be using the default hierarchical nav view design with little/no customizations to the padding or item indentations.
Regardless, we'll be using the default hierarchical nav view design with little/no customizations to the padding or item indentations.
Is that the design shown in "Option 2"?
Will there be an optional to disable Quick Access?
I think so
Most helpful comment
I don't know how hard it would be but ideally it should be possible to rearrange the items in the sidebar. Additionally, the home page shouldn't prevent improving the sidebar.