Here are couple different takes on creating a default Finder window size + view, including a fun and easy to implement AppleScript for locking a window into a specific spot in a display. So, let’s get started on how to permanently resize Finder windows.
This first method to permanently resize Finder windows only works for icon and list views, which allow the user to set defaults.
• 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)
• Select always open, and then click Use as Default button
If you’re looking for a method to lock a Finder window into a specific location in a monitor, including a second monitor, Apple Support Forum poster Joe F has posted an AppleScript on how to get that done.
Moreover, follow up questions from other posters flesh out configuring the AppleScript to specific needs.
via Apple Support Communities