Downloaded a dreamcast emulator and have now lost my playstation games.

Hey, so I downloaded a dreamcast emulator (by accident) and my digimon games have vanished completely I can't find them anywhere and don't have a clue what I am doing.
Has it switches to a dreamcast emulator home now? Is their a way to switch it back?
Help needed.
Thanks guys.

Uninstalled the app and now I have more complications.
I had digimon world 2-3 (which I downloaded from freeroms) and digimon world (which I downloaded from another rom site) in my run game part of the app no problem before, now whenever I unzip a new game it takes away whatever game was unzipped first so i can't have more than 1 at any given time now, why is this happening 😣