Fix every lineup before kickoff

1. Open Today. The Must fix list names every league with an empty or ineligible starter, a player on bye or ruled out, or a lineup that locks soon.
2. Go to My Teams → Lineups and choose Optimizer. Each league shows current against optimal with the projected points beside every player.
3. Click Optimize All Leagues. Review the suggested swaps; an (O) or (D) tag on a starter is the usual reason.
4. Click Save All Changed. The lineups are written to Sleeper immediately. Nothing is saved until you click.
5. For a starter who is (Q) and plays late, arm an auto-sub: pick the replacement and the swap is made only if he is ruled out before lock.
6. Back on Today, hit Refresh. Must fix should be empty.

Prefer to do it by hand? Switch to Manual, all leagues to edit every lineup on one page with the bench in view.