'Hidden' columns in worksheets do not 'Hide'

[Amorphous - Julian 230]

Sometimes we need to 'Hide' columns in a worksheet, so we can keep the worksheet growing.

 

An example is 'Document Transmittal'.

 

To 'Hide' a column in a worksheet we will set the column width to '0mm' wide. 

But even when hidden, the contents of the columns still somehow shows through (See image). Can we get a fix?