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參考資訊如下
Multitask Like a Pro on Your iPad by Using Up to 4 Open Apps ...

2023年5月8日 — Apple's latest multitasking feature for iPad lets you go beyond Split View's two-app restriction to use up to four apps at once.

Use multitasking on your iPad

2023年11月8日 — Work with two apps simultaneously, drag and drop content between apps, and more.

Get More Done

iPadOS allows you to easily view two or three apps at a time and drag and drop between them.