I found some remarks about this in years old threads at reddit, as today, it is still not possible to change the default zoom level for starting / opening new documents. I work with smaller graphics most of the time and it feels very unintuitive, having to reset the zoom to 100% each time - it is of course possible to use a shortcut or toolbar button, but that's one unecessary click ;) Thank you all for this grande piece of open-source software.