Earlier today, Apple released iPadOS 16.1, developer beta 3, which adds Stage Manager support for the 2018 and 2020 12.9-inch iPad Pro as well as the 11-inch iPad Pro. However, external display support will remain an iPad M1-only feature to be released in a future iPadOS update later this year.
In a statement to Engadget reported by N. Ingraham, Apple said:
We introduced Stage Manager as a whole new way to multitask with resizable overlapping windows on both the iPad screen and a separate external display, with the ability to run up to to eight live apps on screen at once. Providing this multi-screen support is only possible with the full power of M1-based iPads. Customers with 3rd and 4th generation iPad Pros have expressed strong interest in being able to experience Stage Manager on their iPads. In response, our teams worked hard to find a way to provide a single-screen version for these systems, with simultaneous support for up to four live apps on the iPad screen.
External display support for Stage Manager on M1 iPads will be available in a software update later this year.
During the pre-testing of the update, our Federico Viticci said that the latest beta version also fixes many bugs encountered by users:
It’s great to hear that Apple is expanding the availability of Stage Manager based on feedback from iPad users. I’m also happy to hear that iPadOS has stabilized. I’ve been using my iPad Pro more often lately, and like many others, I’ve experienced frequent crashes and visual issues in iPadOS 16.1 betas. It shouldn’t be long before the public release of iPadOS 16.1.