Until the OnePlus Open launch in 2023, it was widely believed that Samsung foldables such as the Galaxy Z Fold 6 (available here at Amazon) offered the best features for multitasking. This changed with a particular OxygenOS feature, making Oppo an equal opponent to Samsung in terms of software. Open Canvas allows users to use three apps simultaneously on the large inner display, two of which occupy 90% of the display content and the third app only around 10%. A simple click changes the ratio in favor of the third app, while a four-finger gesture zooms in to display all three apps in full.
Similar mode discovered in early Android 16 version
Android expert Mishaal Rahman has just discovered a similar multitasking feature in a very early stage of development in the Android 16 Developer Preview 2 on his Pixel device, as the video below demonstrates. The feature does not yet function correctly, but you can see that upon activating a new "flexible split-screen mode" (when trying to drag a third app into an active two-app split-screen scenario), a three-app scheme similar to Open Canvas appears. Whether this potential three-app split screen mode will work on tablets with Android 16 in the same way as Open Canvas on the OnePlus Open or the OnePlus Pad 2 has not been confirmed, but it has not been ruled out either.