Google will roll out campaign-level negative keywords for Performance Max campaigns at the beginning of Q4, giving advertisers more control over ad targeting.
They will apply to both Search and Shopping inventory.

This long-awaited feature allows brands to exclude specific search queries directly at the campaign level, improving ad relevance and alignment with audience preferences.
Previously, advertisers had to request exclusions through Google account managers. With this update, advertisers can fine-tune their campaigns more efficiently by themselves whenever necessary.
Read the official announcement here: New features and controls for your AI-powered campaigns.
UPDATE: The rollout of negative keywords for Performance Max campaigns is set to continue into 2025.