The organic-growth leaderboard.

Momentum (default) ranks by growth velocity: your average daily clicks over the last 7 days versus the prior 21, weighted by size. A fast-growing small site can out-rank a big but flat one — and a shrinking site drops below its steady peers.

Volume ranks purely by total organic clicks over the last 28 days — the “who's biggest right now” view.

Pending sites appear at the bottom without a rank. They've connected but have no verified clicks in the current window yet (Search Console data also lags a couple of days), so there's no growth or volume story to rank them by — yet.