Look under the "Downloadable Content" section in the system menu to confirm all packs (Episode Shadow, Super Sonic, etc.) are marked as installed.
For those utilizing custom firmware (CFW) on their Switch, the NSP format is the gold standard. It is essentially the digital installation format used by the Nintendo eShop. sonic forces switch nsp update all dlc full
. This is often preferred for emulators like Ryujinx or Yuzu to keep your library organized. Key DLC Content Episode Shadow Look under the "Downloadable Content" section in the