Hmm that was easier than I thought.

  1. Load up Nautilus and head to Edit → Preferences
  2. Under the Views tab, change the Icon View Defaults' zoom level.

That does only give you choices of 33, 50, 66, 100, 150, 200 and 400 percent scale so if there's an absolute method of setting the size, I'm open to that too. 66% is a bit too reduced IMO.


Alternatively launch dconfeditor org ->gnome ->nautilus ->icon view then chose default zoom level enter image description here