Something that surprised me while watching an iPhone Duo review on YouTube

As a Fold user, I have no intention of buying the Duo, but I was just curious so I watched Techmong's review.
Setting everything else aside,
I was surprised by the fact that the Duo's split-screen is limited to only 5:5,
and that the split-screen disappears when switching between landscape and portrait modes.
With the Fold, a major advantage is being able to freely control up to four screens at once, including 3-way splits and pop-ups,
but they have restricted the freedom of resizing split screens on such a large display.
Hmm...