Apple may have changed the volume controls in iPadOS and iOS 13 to be less in-your-face, but that’s not the case with Siri. Summon Apple’s assistant and it will still overtake your entire screen and stay there until it’s done thinking and doing whatever you asked it to do, regardless of whether you have a 4-inch iPhone SE or a 12.9-inch iPad Pro.
That might change in a future update. As MacRumors reports, Apple VP Craig Federighi responded to iPad fan Juliano Rossi's question about Siri’s interface with a hopeful yet vague response: “What you describe is certainly valid feedback. Unfortunately, it's not something we can add in at the last minute, but we will certainly consider it for the future.”