Multi-window experiences are no longer a niche feature — they're becoming the standard on Android with desktop windowing, foldables, and external displays, and on iPadOS with Stage Manager and its new windowing engine. Flutter developers who still architect around a single, fixed-size screen are already falling behind.

This session introduces the core concepts behind building multi-instance, adaptive Flutter apps. We'll cover how Flutter engine groups enable lightweight parallel instances, how to manage state across windows, and how to design layouts that respond gracefully across all displays — from split-screen panes to a tablet paired with an external monitor.

This is a practical primer: what multi-window and adaptive layout really mean today, why they matter for Flutter apps, and where to start when architecting for this new reality. You'll leave with a clear mental model and a concrete starting point.