You can show hidden boxes and lines, making them visible again. This option is enabled only when the selected objects are already hidden.
To show hidden boxes and lines:
1 Select the hidden boxes or lines you want to unhide.
2 Click the Format tab and select Show from the Visibility section.
The selected boxes or lines are shown.
Note: To temporarily show hidden boxes or lines, click the View tab and select Show | Hidden Boxes or Hidden Lines.