haysfamily6b This is the default behavior of iPadOS for “Windowed Apps“ when working with apps supporting multiple windows. You can switch to “Fullscreen Apps” in the system settings for multitasking if you prefer the working style before iPadOS 26.
Here is an Apple article with some details about multitasking, especially the option to close all windows after swiping to the home screen might be helpful (if it’s disabled you need to swipe twice to close all windows).
Edit: I'll move this discussion into the "Tips & Tricks" section as this one is for topics regarding the forum itself - I hope you don't mind…