Although more secure than right-clicking a tab and clicking "Hide," making a worksheet very hidden isn't a fail-safe method ...

First, when you hide columns in Excel (by right-clicking the relevant column or columns, and clicking "Hide"), it's easy for ...

2. To unhide all hidden columns in Excel, navigate to the "Home" tab. 3. Click "Format," which is located towards the right-hand side of the toolbar. 4. Navigate to the "Visibility" section.