A bunch of my files and folders are invisible on my desktop computer, but they're still accessible if if go to the Dropbox website, where I get the message: "this folder is hidden from your device." None of these files or folders are "Teams" or anything like that. They're just mine, and now I can't access them from one of my desktops. I don't recall ever hiding them. How do I UNHIDE things? And how do I turn off this awful feature so it never happens again?