Currently, especially in portrait mode, you can barely zoom out of a document like you can on Notability, which is definitely a UX design oversight. At least have an option for this I'd say.

This would especially be useful for math, where you often move back and forth upwards and downwards to reference previous content, but unfortunately with Goodnotes, you are unable to see large amounts of pages at the same time, or be able to scroll up and down many pages quickly due to lacking this feature.