How to resize Finder window permanently in Mac OS X
Open Finder and adjust the size as per your wish. Close the Finder window. Now, this is the main step. Press the Option key and right click (Control+click, or a Two-Finger click on trackpad) on the Finder. You would see a list of the options, click on relaunch. That’s it. From now on whenever you open the finder, it would be in the size you have set.
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