To manage the columns across different worksheets and exisitng, click on worksheet properties. 

A new window will pop up as below, wherein you can manage columns: 

• To hide the exisiting column click on "eye icon"

• To make the column visible again click on "Manage column " --->"Show Hidden Column"

• The hidden columns are visble as below, click on the faded "eye icon" to make it visible in the worksheet. 

The hidden columns are basically the fields which you havent selected while created a new workbook from the " Managed Data Sources " depending upon the entity. 

The hidden columns gives you the ability to bring the column back into exsisting worksheets and can be helpful to relate the columns with each other across different worksheet.