Outliner Zoom

The zoom feature for outliner is disabled under View. So I ended up increasing the font size but that poses a problem when printing in paper or PDF as it’s too big. Is there a better way?

Zoom is only available for text views, which contain rich text and so cannot have the font size changed on the fly. For the outliner you should just change the font size, as you have done. When printing, the outliner font isn’t used anyway, but is set via File > Page Setup > Scrivener (from the top menu button) > Outlines.

All the best,