Allow users to hide individual mailboxes
I don't use certain mailboxes, such as Unread, Starred, and Archive. It would be nice if I could hide these mailboxes, so that there is room on my screen to see all the personal folders that I've created, rather than having to scroll down to see the entire list. The other option is to decrease the amount of space between mailboxes and folders, so that more can be seen on the screen at once.

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Doug Cherry commented
Allow us to decide if "folders" or "views" should be directly after the mail-boxes.
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Jan commented
Yes, please! I don't like them showing, nor do I like the entire "Views" section. I'd accept moving them below my personal folders if that's easier to do, but the option to hide them would be great.