If your queue says there are no more leads to work — but you know the list still contains leads — the most common reason is that the remaining leads are call-backs scheduled for a future time.

When you finish a call with the Call back disposition, you choose a follow-up time ("after 30 minutes", "after 1 day", and so on). The queue deliberately holds those leads back until they're due, so you never call people back earlier than the time you chose. The leads aren't gone — they're waiting for their scheduled moment, and they'll re-appear in your queue automatically when it arrives.

The queue's lead state filters control which groups of leads are served at all. You'll find them on the Queue tab while working a lead, or at the top of the queue page under "Lead state filters (applies to all queues)":

The number after each checkbox shows how many leads are currently in that group, and all three are ticked by default. If one is unticked, that whole group is left out — which is why the queue can be empty even when the list still has leads to call. When the queue is empty, take a second to check that the relevant boxes are ticked.

Please note: ticking "Enqueue postponed and unscheduled leads" does not pull future call-backs in early. Even with it enabled, a postponed lead only enters the queue once its follow-up time is due — the checkbox simply controls whether call-backs are included in your queue at all.

If you'd rather have call-back leads return sooner: