Search Terms picks the mode from the campaign's Google bidding strategy: Target CPA or Maximize Conversions → CPA mode; Target ROAS or Maximize Conversion Value → ROAS mode. Nothing to set.
CPA mode judges cost per sale against target. ROAS mode judges value returned per dollar, and is more protective — the only auto-negatives are terms that returned zero value, so anything that brought back revenue is never auto-blocked. Built-in checks keep a CPA campaign from ever picking up a stray ROAS value, and vice versa.
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