If you have custom fields, configured in the defect layout on your project, you can add these custom fields as columns to the defects table view.
Select the Defects module in the left side menu → the table view with the defects will be displayed;
Expand the Customise option on the right top of the defects table → Customise Table options will be displayed;
Check the checkbox for the fields you would like to add to your table. Selected fields will be added to the table immediately.