I was looking for a particular sketch, and ran into the same problem for two different art programs; a bunch of stuff is all nested in one file. It is not all visible at a glance. And I couldn't remember which program I had drawn it in.

This has happened before. It will happen again.

All the stuff from one file in CSP:

That wasn't so bad. But then.

All the stuff from a file in SAI:

But wait! There's more! Because within a folder within a file, there are a few more folders!

And hey!

It's the sketch I was looking for in the first place.

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Anyway.