It looks like you can only search through contacts within the all Contacts tab - but not within Segments or Groups. Would love that functionality. Sometimes I need to look for contacts within a Segment and there isn't a quick way to easily do that.
This is an excellent idea! Not only would it be great to have the search function there, I would love to see a checkbox next to the search bar that gives you the option of limiting the search to just the segment/group you are viewing so you can easily control the results.
Rest assured that I will be passing this feedback along to our developers so we can make sure this feature gets some traction!