An easier way to find those pesky sprites when you have so many!
A blank sprite with the name “Folder 1” Appears when you click new folder, then you can rename it like any sprite, and drag sprites into it! Than you click in arrow where the “I” would be if it were sprite, and you see the sprites in that folder, and it also hides the other sprites and folders!

Good idea! However, this was already suggested here.