Can I add columns in the popup for the lookup fields?
Yes, you can add columns in the popup for the lookup fields.The columns in the lookup field popup are based on the columns specified for the "All Record" List View. For example, in the Contacts tab, there is an Account Name lookup field. The popup for this field has the columns that are available for "All Accounts" list view in the Accounts tab. So, if you want to add columns, you need to edit the corresponding List View and add the required columns.