Back with an update: So, remember how I said above that the solution was to first go to:
C:\Users\YourUserName\AppData\Local\UnrealEngine\Saved\Config\Windows\EditorSettings.ini for older versions (like UE4 or the initial releases of UE5), or go to: C:\Users\YourUserName\AppData\Local\UnrealEngine\Saved\Config\WindowsEditor\EditorSettings.ini for newer versions (like the latest UE5), and then remove all of the RecentlyOpenedProjectFiles=… entries that you wanted to get rid of?
And do you remember how @vlab22 said you should also do the same for all the CreatedProjectPaths=... fields in that same EditorSettings.ini file, despite me saying I couldn’t find any valid correlation to his statement?
Well, it seems that the Epic Games Launcher does indeed care about those CreatedProjectPaths=... fields, but the trick is that it’s not about those found in the EditorSettings.ini file I mentioned above, but in the following path: C:\Users\YourUserName\AppData\Local\EpicGamesLauncher\Saved\Config\Windows\GameUserSettings.ini, so it’s kind of like a combination of my solution and @vlab22’s solution 