First, when you hide columns in Excel (by right-clicking the relevant column or columns, and clicking "Hide"), it's easy for ...
Although more secure than right-clicking a tab and clicking "Hide," making a worksheet very hidden isn't a fail-safe method ...
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.