Use custom archive template for your custom taxonomy. so if your taxonomy is ‘XYZ’ , its archive page will be taxonomy-XYZ.php. Now in this custom archive page for your custom taxonomy, you can choose to add /remove sidebar as per your requirement.
Use custom archive template for your custom taxonomy. so if your taxonomy is ‘XYZ’ , its archive page will be taxonomy-XYZ.php. Now in this custom archive page for your custom taxonomy, you can choose to add /remove sidebar as per your requirement.