Hey, I get your frustration. Right now, Steam's Big Picture mode on macOS doesn't have a built-in filter to show only Mac-compatible games in your library.

However, here's a workaround you can try:

- Switch to Desktop Mode: Exit Big Picture mode and use the standard Steam interface.

- Filter Mac-Compatible Games: In your library, look for the Apple logo near the top-left corner. Clicking this will filter your library to show only games compatible with macOS.
Reddit

- Create a Collection: You can create a custom collection (like "Mac Games") and add all your Mac-compatible games to it. This way, even in Big Picture mode, you can access this collection directly.

While it's not a perfect solution, it can help manage your library more effectively on a Mac.