It’s very “lipstick on a pig”, but you can run the PWA side by side with the native desktop. I have many screens so I keep non-call activity in the PWA version to avoid this nonsense.

I’m sure they will add tabs eventually as an afterthought and make it even more obtuse though.

I also reflexively delete the personal OneNotes and start a new one where I want it to be, but the war between me and Microsoft about how I want my personal documents stored has now raged for many many years.