There's no way to see the list of contacts within a segment without having to export for that segment. It'd be great to view the list of contacts for each segment within the UI without having to export. As you're building this, there may be value within that list that helps us understand what segment attributes it matches up to (e.g., Matched to Rule Line Item #1: Rule Group.) Consider even allowing us to name each segment rule as well so its more clear.