What are the preview windows in iMessage on iPadOS 15?


I updated to iPadOS 15 and I am confused by the preview windows in Messages. I am not sure how they’re meant to help me. I have five and three of them are for the same message. I have two preview windows in PDFPen. They seem a bit weird,

It is interesting that no one knows the answer to this. I asked at the Apple store what they were and they had no idea. Attached is a screenshot.

I worked it out. These are Messages that are opened in other windows. If I long press on Messages, tap show all windows I can see them all and then close them. That answered the PDFPen question as well.