Lookalike segments in Demand Gen changed from hard targeting limits to audience suggestions from March 2026

Starting March 2026, Lookalike segments in Demand Gen no longer cap reach at the narrow/balanced/broad similarity thresholds; Google AI may expand beyond them when it predicts more conversions or lower CPA. Advertisers must file a form to opt out.

Documented in Google's Help Center and FAQ updates per PPC Land; opt-out removal takes about a week and UI opt-out controls were promised later in 2026. Applies only to Demand Gen, not Video brand campaigns or DV360.