So please once verify whether you have changed the original code in the theme to display the column or not ? If you have then please do not make the modification directly in your original theme as the original modification will be lost .
For the fix you need to activate the child theme . After activating the child theme in your child themes functions.php file paste below given code .
add_filter( 'loop_shop_columns', 'loop_columns', 30 );
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