Click on 
Column Chooser in Manage Grid whenever you want to hide or show columns available to you.
When the Column Chooser is visible, click the header of the column you would like to hide and drag and drop it into the Column Chooser.
To show hidden columns, drag and drop them from the Column Chooser to the
...
desired position.
Click "X" to
...
hide the Column Chooser. This will not change your current column configuration.