By default, response tables display a column for each field's values. To hide a column you don't need, right-click the column's name and select Hide Column.
The Table Settings window lists every column available for your form. You can toggle them by checking or unchecking their checkboxes. Some columns, like "Author", are generated automatically for every form. Large Textarea fields are hidden from tables by default because of the size of their content, but they can be enabled from this screen.