This tool was built specifically to help with managing project directories in the Epic Games Launcher for Unreal Engine projects. This tool just makes it easier than modifying the configuration file directly.
I have no idea why this isn't a built in feature for the EGL.
I made a post about it on my website here: https://rhyce.dev/2022/04/14/fix-unreal-projects-not-showing-in-the-epic-games-launcher/
Yep. It's pretty simple.
Get the latest download here: https://github.com/Rhyce/EGLProjectPathManager/releases/latest