Stage Manager is the new multitasking interface Apple announced during WWDC in June for iPadOS and MacOS. Stage Manager only works with M1-powered iPads due to some assumed limitations of older iPads. In a statement to Engadget, Apple confirmed that more iPad Pro models will get the features of iPadOS 001.1.
We introduce Stage Manager as a new way to multitask, both on the iPad display and on a separate external display Overlapping, resizable windows with the ability to run up to eight real-time applications on the screen at once. This multi-monitor support is only available with the full capabilities of the M1-based iPad. Customers of the 3rd and 4th generation iPad Pros expressed strong interest in being able to experience Stage Manager on their iPads. In response, our team has been working hard to find a way to provide single-screen versions of these systems while supporting up to four real-time applications on the iPad screen.
External Display Stage Manager support on the M1 iPad will be available in a software update later this year.
In the current implementation of the beta version of iPadOS 16, testers report an issue with Stage Manager when active on an external monitor. For this reason, Apple is delaying external support for Stage Manager on the M1 iPad until it can improve its stability.
Stage Manager on iPadOS 
Now, and until later this year, the M1 iPad will not be able to use Stage Manager, 3rd and 4th generation iPad Pro models (running A16 X and A16 Z Bionic Chip) will not support functionality via an external display – it will only work with the built-in display on those non-M1 iPad Pro models.
iPadOS 22 External monitor support
iPadOS 16.1 and MacOS Ventura both introduced Stage Manager. Both updates are expected to arrive sometime this fall. MacOS is expected to see an update sometime in October.
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