Window management on iPadOS is a mess. The old way (only one app, Split View or slide over) worked well, but is mostly gone since iOS 26. With iOS 27 the new window management became a bit better. But it's still pretty unusable without a mouse/pointing device. But even with a mouse it's not intuitive.

I use my iPad 99% without a keyboard and a mouse, and the window management only became worse over time. It got more features, sure, but it got very hard to use in a useful way.

So I'm back to the single app mode most of the time, which provides less functionality than 10 years ago.