Hide columns
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Select one or more columns, and then press Ctrl to select additional columns that aren't adjacent.
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Right-click the selected columns, and then select Hide.
Note: The double line between two columns is an indicator that you've hidden a column.
Unhide columns
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Select the adjacent columns for the hidden columns.
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Right-click the selected columns, and then select Unhide.
Or double-click the double line between the two columns where hidden columns exist.
Source: Microsoft