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That same setting has a section called Default List for Single Actions. That's most likely where those "missing" actions went. But if they don't seem to be there, the way to find them is to use the All Items perspective under the Perspectives menu. With that perspective, even if you've inadvertently set some view options to hide some or all of missing actions from sight, you'll see them. Once you figure out where they are, you can move them to where you want them.