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.

Microsoft Excel offers several tools you can use when you need to fill a column with the same text or numbers. Instead of completing each cell manually, you can quickly fill in the entire column ...

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