GoKawiiliPadOS 27.3 beta adds double-tap-to-zoom option for app windows
Apple's iPadOS 27.3 beta introduces a new toggle under Settings > Multitasking & Gestures called 'Double-tap Top of Window to Zoom.' When enabled, double-tapping or double-clicking the top of a window instantly expands it to full screen, and doing so again restores its previous size.