So far so good!
I’d like to see a new layout implemented. I’m sure most users use Outlines to organize their notebooks so it’d make perfect sense to have a fast way to access the outline of the notebook without having to press on the four Rectangle button and then click on Outline (when being in thumbnails or favorites).
So my recommendation is to have a button to directly show the notebook outline, since I’m working a lot with lectures slides and I have one notebook for each course. The placement of the button could be near the title on the tab of the document or somewhere on the left side of the screen or the right (not everyone is right handed). Another idea would be a gesture-based outline appearance, when for example dragging from the left of the screen edge or the right. You could also implement a setting for this where users set their own preference about the outline view!
I’m sure most users would find this quite helpful and it will make you stand out of other note taking apps. I know at least twenty students who study with me and use GoodNotes and they all expressed this wish.
I hope you can do it,
I hope to hear from you soon!