If you find that you are automatically signed out every time you close the Epic Games launcher, and want to remain signed in, follow these steps:
1. On your PC, open your browser and go to: https://www.epicgames.com/id/login
2. Click “Sign in with Epic Games” and sign in.
3. Sign out and exit the Epic Games launcher.
4. In Windows, locate the search bar and type "Epic Games launcher".
5. Right-click on the Epic Games Launcher app and select 'Run as Administrator', then follow all of the login steps.