I Revealed (Unhid) PERSONAL.XLSB: How do I Hide it Again?

If you have saved any macros for general use, you would have saved them in the PERSONAL.XLSB workbook.  This hidden file loads when Excel launches. It is because it is in memory that those macros are always available.  But, as with any hidden file, it is possible to unhide it.  For example, with the View…