When reading an article or reviewing a professor’s lecture slides (they always upload it as a PDF instead of a PPT format so I can’t edit the way it is exported). GoodNotes often fills the whole page with the PDF. It makes it great for reading, however, there isn’t much space to annotate. I usually get around this by zooming out but GoodNotes is a bit more rigid when it comes to that. Other than that it is a great app!