На стороннем ресурсе наткнулся в свое время на решение:
Create a new folder on the Desktop (CMD+SHIFT+N), open it, select View-View Options (CMD+J), set the window to your desired size and type view (either icon or list view: I prefer the latter), select always open, and then click Use as Defaults button. That should retain your setting and every other folder you open for the first time should also inherit those settings.
Для ресайза окон, могу посоветовать
приложение Moom.
Или бесплатную
Window Keys.
