Log out of a device remotely
You can log out of any computer, phone, or tablet remotely on dropbox.com.
When you log out of a computer remotely, the Dropbox files synced to that computer remain on that computer and can still be accessed and opened. (This includes folders backed up from your computer, but doesn’t include online-only files). However, changes made to your Dropbox files on that computer won’t sync everywhere else you access your files in Dropbox until you log back in on that device.