Clicking "AutoFit Column Width" forces Excel to adjust the width of the columns you selected so that they are wide enough to display their contents. Every Excel spreadsheet has a "Select All" button.

If you don't want to set the height or width of rows or columns in Excel, you can use Excel's AutoFit feature to automatically contract or expand cells in Excel to fit their contents.

Since it's a frequently used feature, you must learn how to use it. To quickly autofit content, double-click the boundary between two column or row headers where data overlaps.