Full path to opened file
Not a revolutionary idea but it might be helpful...
When the user opens a file in File Manager, only the file name appears at the top left. I suggest to show also the full path since a given file name (e.g. index.php) may appear in multiple folders.

Even small ideas can make a big difference. Thank you for this one. We will consider this functionality in upcoming releases if it will be popular.
Everyone, please continue voting for this feature if you consider it important.
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Christopher Vassallo (Topher) commented
it would be great if you could make the area that's currenlty a 'breadcrumb' a 'current location populated' form field too. This way admins could navigate structure more efficiently.