Lemuroid is smart, but you can help it. Organize your Roms Pack like this:
To make your "Pack" feel truly premium, consider these customization options: Multiple disc games (.m3u files) | RetroArch PC Tutorial 22 May 2022 — Lemuroid Roms Pack
Assuming you have downloaded or created a pack, follow this guide: Lemuroid is smart, but you can help it