https://codeboxr.com/show-custom-taxonomy-as-post-listing-admin-columns/

gistfile1.txt

//category doesn't show as admin column
				$cat_args = apply_filters('',  array(
					'hierarchical'   => true,
					'label'          => esc_html__('Categories', 'cbxgooglemappro'),
					'show_ui'        => true,					
					'query_var'      => true,
					'rewrite'        => array( 'slug' => 'cbxgooglemapcat' ),
					'singular_label' => esc_html__('Categories', 'cbxgooglemappro')
				));
				register_taxonomy( 'cbxgooglemapcat', array( 'cbxgooglemap' ), $cat_args );
				
				
				//category shows as admin colun
				$cat_args = apply_filters('',  array(
					'hierarchical'   => true,
					'label'          => esc_html__('Categories', 'cbxgooglemappro'),
					'show_ui'        => true,
					'show_admin_column' => true, //see this line
					'query_var'      => true,
					'rewrite'        => array( 'slug' => 'cbxgooglemapcat' ),
					'singular_label' => esc_html__('Categories', 'cbxgooglemappro')
				));
				register_taxonomy( 'cbxgooglemapcat', array( 'cbxgooglemap' ), $cat_args );