Most PS1 games have multiple discs that you need to change. How does it work on emulator? Can you just click on options setting on emulator to switch discs?

Without providing the emulator idk how we can help you.

However, literally the first google result for “ePSXe disc changing”. Google is strong, always Google your questions. https://forums.emulator-zone.com/showthread.php?t=18512