Google is testing channel controls in Performance Max: sliders that let you tell PMax how much YouTube, Maps or Display matter to your business.
It is the biggest change to PMax since PMax launched — and it is not a tick box. Unlike Demand Gen, where you opt a channel in or out, channel controls give you a slider per channel that adjusts how much the campaign prioritises conversions from that channel. A positive adjustment relaxes the CPA target for that channel. A negative one tightens it.
Mike Ryan and Chris Scharmueller work through what that actually does to a live campaign. Google says the campaign still optimises toward your overall target CPA — and also says adjusting the sliders will directly impact performance. Both cannot be true without a trade-off somewhere else. Push YouTube up, and something else has to tighten. The interface gives you no numbers to predict which.
They also take on the claim from Jyll Saskin Gales that channel controls prove PMax was a failed experiment. Mike argues PMax has lost its identity as Demand Gen moves down funnel and Shopping gets upgraded with AI Max. Chris argues it is not failure but forced evolution: adoption stalled, the market pushed, Google conceded.
Then the bigger question — if the most advanced ad platform in the world had to hand control back, what happens to Advantage+, TikTok, Amazon and every other "Max" built on the same thesis?
The upside: skill matters again. Two accounts run by the same AI used to be a coin flip. With levers like these, the better operator can win.
💡 Key Takeaways
• Channel controls are sliders, not switches — you cannot zero out a channel, only reprice it. A positive adjustment relaxes that channel's CPA target; a negative one tightens it.
• Google's help text contradicts itself: the campaign still optimises to your overall target CPA, yet the sliders "directly impact performance". Push YouTube up and something else has to tighten.
• YouTube defaults to low importance for a reason — CPM-based, reach-oriented inventory that converts through view-through and remarketing. Pushing it up is unlikely to find the volume you want.
• Most advertisers will use it backwards: dragging YouTube, Maps and Display down to make PMax behave more like a Shopping campaign.
• There are no numbers on the slider. Without them, the risk is that it feels like control rather than being control.
• Failed experiment or forced evolution? PMax 2026 has more control layers than Smart Shopping ever did — and if Google had to concede, Advantage+ and every other "Max" will follow.
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