Okay, so in Eclipse you can switch your workspace, right? Well, what if you open a workspace that you no longer use? It just keeps showing up on the list of recent workspaces. So, how do you remove it? Pretty simply actually.
You’ll need to navigate through some hidden folders to do so, in which case it’s usually easier to do through a Terminal window. Note: these instructions will work with Linux and OS X. If you’re on Windows, you’ll have to call Bill Gates, although it’s possible this will also work.
In the terminal, navigate to eclipse/configuration/.settings, where eclipse is your Eclipse installation folder. In this folder there is a file called: org.eclipse.ui.ide.prefs. Edit this file, and you should quickly see the line that says “RECENT_WORKSPACES=” followed by various paths to workspaces you’ve used. Simply delete the workspaces you don’t want. They are separated by “/n”. So make sure to leave a “/n” between each workspace. Additionally, you must leave the information on a single line. Do not break it out to multiple lines.
QUICK ANSWER: eclipse/configuration/.settings/org.eclipse.ui.ide.prefs