Concealing columns can be useful in instances when a column is necessary for row level specificity but is not desired to be shown, or to make your table more manageable/interpretable by hiding the columns that aren't needed. To hide a field, simply right-click on it and select 'Hide.' Note that you can easily conceal all unnecessary fields by using the drop-down menu in the upper right corner of the data window and selecting 'Hide All Unused Fields.'