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.

How to Automatically Put in the Months of the Year in Columns in Excel. Microsoft Excel's automatic data fill-in feature is a time-saver, filling in cells for you so you don't need to manually ...

You can easily hide and unhide columns in Excel by individually revealing hidden columns or using the "Format" option to unhide all hidden cells.