For anyone struggling with this, here is your working solution:
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Make sure you first close your Epic Games Launcher (check the tray icons in case it’s still running in the background)!
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In order to physically delete the project from your Epic Games Launcher, navigate to your library, right-click the project you wish to delete, then click Show in folder and once you’re redirected to its root folder location, just Shift+Del the files yourself;
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If, however, you have multiple copies of your project and you’ve opened several of them, now the Launcher will show all of those duplicates for each opened location. In order to remove such unwanted entries of your project from the Library under the MY PROJECTS section, go to
C:\Users\YourUserName\AppData\Local\UnrealEngine(replaceYourUserNamewith the correct string) and now you will see a list of all the UE versions you have installed, including those you might have uninstalled in the meantime. It should look something like this (your version numbers will obviously vary):
What you need to do is go through each and every version folder (yes, all of them, as your project might have been opened with multiple UE versions along different engine upgrades, in which case you will see cached duplicates of the same addresses throughout multiple version folders), then go to either Saved\Config\Windows or Saved\Config\WindowsEditor (depending on the UE version)
and try to find a file called EditorSettings.ini.
Once there, open it with Notepad and search for your project name and delete all of the RecentlyOpenedProjectFiles=… lines which contain your project’s location (again, there might be more than one, depending on how many places your project was opened from).
Now save your file and re-open your Epic Games Launcher.
Voilà! 