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I love new features, don't get me wrong, but not at the cost of them cluttering up the UI with features I rarely (or never) use. The sidebar on the web keeps growing with no way to tame it. How about...
Currently, when you open a file via Dropbox web, the righthand sidebar showing the ability to comment and download the file automatically opens. This sidebar is huge, about 25% of the screen, and autmatically minimizes the item you're trying to view. My business does not use the comment feature, we have no need for it, so every time we open a file we have to hide that sidebar to see the file at full width. When minimized, the sidebar has easy to access to the exact same features with the benefit of taking up drastically less space. I would love to have the option to auto-hide the sidebar in my system preferences unless I choose to expand it, rather than the other way around.
I have to imagine there are other users in my posiiton that value the full width view of the file over the detailed (and space-hogging) view of the sidebar.