I’ve only been using iPadOS 26 for a limited time, but you have to use Stage Manager to group apps together and so far for me it’s significantly better than iPadOS 18. On macOS, I would use desktops to group my apps together. So I would have 3 Desktops (one with Calendar/Mail/Reminders, one with Photos and another with Safari and Messages) and I would swipe between them with gestures.
So far on ipadOS 26, I’m doing the same but with Stages. So I have a stage with social medias apps (FB, X, Insta), one with Calendar/Mail/Reminders, another with photos and another with Safari and messages. Swiping through them is similar to swiping desktops.