Very small type size upon starting evince pdf viewer
You can set defaults from within Evince ("Hamburger" menu > Save Current Settings as Defaults)
Settings are stored in ~/Library/Preferences/evince.plist, so defaults write ~/Library/Preferences/evince.plist "/org/gnome/evince/default/zoom" 1.5 does the same as gsettings does on Linux.


Setting the zoom level to 200% and then saving the current settings will lead to evince to open with 200% the next time. Window size isn't preserved though so it may or may not be helpful.