If you use the column layout of the Finder in the Mac, you probably run into the problem where the file name does not fit in the column. There's a cool trick that you can use when this happens so that the column will automatically expand to match the width of the longest file name being shown. Just double-click on the double vertical line icon below the scroll bars (shown in the image below in the red circle). When you double-click it, the width of the column will adjust automatically.

The circled area shows the area to click to auto-expand the column width