Rocks'n'Diamonds

When I opened the new emerald mine collection I recall the view being different. But now after I messed up with some graphics / game engine settings, the level uses r'n'd graphics set and has a thin toolbar on bottom which is not how I remember the leveset when I opened first time. How do I reset all settings? Where does r'n'd store its settings. I'm using windows 11 64 bit.

Check the custom artwork settings. If you have "Override level graphics" set as Yes, then that's probably the problem, because it should be No to always have whatever artwork levelset uses. And same for music and sound overrides as well.