The 'Paid search' dimension lets you look at any metric and compare it between paid search and natural search. All other hits outside search engines are omitted. This dimension is helpful to understand how your paid search efforts compare with organic search.
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The only requirement for this dimension to work properly is to have Paid search detection configured correctly in report suite settings. If paid search detection is configured correctly and a report suite has data, this dimension always works.
Dimension values include two static values: "Natural" and "Paid" . If a visit matches criteria for a search engine and also matches paid search detection, it belongs to the "Paid" dimension value. If a visit matches criteria for a search engine and does not match paid search detection, it belongs to the "Natural" dimension value.