原推：This is also another odd situation in which Apple is offering users two distinct interfaces for a key feature. You have to turn on Stage Manager in Control Center on both the iPad/Mac. It’s not the default. Different, but reminiscent of Apple offering two distinct Safari UIs https://t.co/rFPir1v2VR
Have not used Stage Manager on iPadOS (oddly does not support the iPad Pro from one generation ago) — but it is a confusing mess so far on the Mac and doesn’t have a clear purpose.