Zooming in/out is very important, particularly when projecting or changing between monitors of different resolutions. Not having this capability makes using Outline impractical in any meetings in which desktop is projected .
not having a Zoom function is, I'm sorry to say it such hard, a joke. I've so many PDFs in OneNote (and now in Outline) and it's not so easy to read them on my iMac-5k. I want to read them in Outline because of my annotations there.
So, please, this should come with the next minor release - I understand, some features sound easy to implement but have large impact to development - but zooming should be a basic feature in V1.0 of a note taking App - in my opinion.