Providing in/out zooming feature on doc page to take advantage of all screen width

Working on an internal knowledge base document for teammates, I realize there is no way (or is there ?) to zoom in/out on the document content from inside Coda’s UI. I am only left with my browser’s zooming feature, which is limited and feels “amateurish”.

Otherwise, on my desktop screen 24’’, the content itself hardly takes up 50% of the available width !

Would be great to have in the UI a zoom level slider to finetune custom zoom level (best), or alternatively (less good) a drop-down with several zoom levels to choose from (as in GoogleDocs).