The ".dropbox" file is something that the app uses to store certain information about your folders and shared folders. You can check out some more info on this here.
This should be hidden though. If you don't have the option on to show hidden files, then you can hide this manually by right clicking the file, choosing "Properties" and choosing the hide the file from there.
I hope this helps, let me know if you have any other questions!
<b>We have created a guide on folder best practice, so you can get organized now <a href="https://www.dropboxforum.com/t5/Business-Tips-tricks/Folder-structure-best-practice/m-p/428456#M39"><u>check it out here</u></a>.</b>
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