How to set a default column width in OS X
If the columns in OS X column view are too narrow for your file and folder names, you can adjust them to a larger default size.
OS X offers different folder view options that can be set by clicking
the corresponding view button in the Finder toolbar: you can choose
from list view, column view, Cover Flow, and icon view. Column view, one
of the most popular, makes possible easy navigation of the filesystem
using arrow keys.
While this view is convenient, in some cases its default column width
may be too small for the file and folder names that you use, so when
you navigate through your files a significant number of names will be
truncated and condensed.
|Hold the Option key while dragging the separator bar to set a new default column size.
To manage these situations, you can drag separators to resize
individual columns, double-click the separator, or right-click it to get
a set of options for resizing columns; however, you’ll need to do these
things again each time you create a new Finder window.
If you want to change the default width of the Finder columns, then
you can do so by holding the Option key when dragging one column. This
will change the size of all columns in all Finder windows, and when you
close and reopen the window, the column sizes should remain.
While this works for the Finder’s column view, it will only work with this view, and not with the others such as Cover Flow.