Looking for a mechanism in iPadOS 26 to 'split a window' into two adjacent windows like it worked in iPadOS 18.

With the new multi-windowing design in iPadOS 26, the behavior of openWindow() has changed.

In iPadOS 18, if I called openWindow(), I would go from a full-screen window to two side-by-side windows. That allowed my app to meet the goal of the user; keep some information on the screen while being able to navigate through the app in the other window.

In iPadOS 26 (beta 3), this no longer works. Instead, a new Window opens ON top of the current window. I am looking for some mechanism to help the user see that two windows are now present and then easily move them on the screen (tiled, side-by-side) or whatever else they would prefer.

I should have noted:

  • I can add a defaultSize to the new windowGroup but if the current window is full-screen, this default is ignored.

  • If the window is not full-screen, then the default size is STILL ignored, but the two windows appear stacked with an offset on top of each other. So this is closer to what I am looking to accomplish, but I need to have it work for both FULL-SCREEN and WINDOWED configurations.

Looking for a mechanism in iPadOS 26 to 'split a window' into two adjacent windows like it worked in iPadOS 18.
 
 
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