There seems to be a GUI that lets you cycle through the games, from the video I saw.
Just look for the exact phrase "3DS ROM Tool". There's even a GUI for it that someone made right here on GBATemp. Otherwise, it's a command line executable, so you'll need to know how to throw basic DOS commands at it. Even so, it's super simple and easy.
I chopped over 50GB of ROMs down to just over 32GB using this tool.
Just look for the exact phrase "3DS ROM Tool". There's even a GUI for it that someone made right here on GBATemp. Otherwise, it's a command line executable, so you'll need to know how to throw basic DOS commands at it. Even so, it's super simple and easy.
I chopped over 50GB of ROMs down to just over 32GB using this tool.