What the Pages section shows
Pages aggregates every advertiser page behind the ads you saved. For each page you see how many ads of it you saved, how many were active at save time, which landing domains its ads point to, and when you last saved one. It turns a pile of single ads into advertiser profiles.
The page detail
Open a page to see two tabs. Saved ads lists every ad of this page in your workspace, as the same specimen cards you know from boards. Landing pages groups those ads by the landing domain they lead to, so you can read a funnel at a glance: which domains the page sends traffic to and how many creatives feed each one.
Page stats and the active ratio
The stats block counts the page's ads across the EU ad library: active ads, all ads, and the resulting active ratio. A page keeping 128 of 141 ads live is spending real money on creatives that keep converting; that ratio is one of the strongest winner signals. Hit "Refresh" to count; results are cached for a day. The active ratio also feeds the Winner Score you see on search results of this page.
Preview mode
While the "Preview data" badge is visible, counts come from the preview dataset, not the live Meta Ad Library. Everything works exactly the same; the badge disappears once the live connection is active.