Assuming you have a worksheet with hidden columns and you want to unhide one column:
Select the columns on either side of the hidden column.
On the Home tab, in the Cells group, click Format.
a. If you don't see the Format option, click the arrow next to Format, and then click Format.
b. If you still don't see the Format option, make sure that you selected two or more adjacent columns.
Under Visibility, click Hide & Unhide, and then click Unhide Columns. The hidden column is now visible.
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