In the Sharing Sidebar, how about moving "Shared Link" and "File Request" to the top and then using all that sidebar real estate down the right side to allow a longer list of permissions to be seen without having to click into the Collaborators menu? Will make reviewing/managing permissions by folder more efficient. Alternatively, instead of "+10 People, + 2 Groups," why not describe that menu: "Full Collaborator List" or something like that.