Well, it looks like the search tool in Xcode 5 is a bit confusing for many people. In my opinion, Apple should have done a better job, allowing the user to know what you can click and what not ... Here's how you get access to various parameters:
After switching on Find Navigator, we can see 3 components ( Find> Text> Containing)

Now you can click on any of them to choose between different options (à la jumpbar)

Finally, you can also click In Workspace(or In Project) to change the search area.

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