Código para modificar el tamaño de las miniaturas de los productos de WooCommerce en la administración

add_action('admin_head', 'my_custom_admin_css'); 
 
function my_custom_admin_css() { 
  echo '<style> 
    table.wp-list-table td.column-thumb img { 
    max-width: 150px; 
    max-height: 150px; 
	} 
	table.wp-list-table .column-thumb { 
    width: 152px; 
	} 
	table.wp-list-table .column-name { 
    width: 15%; 
	} 
  </style>'; 
} 

Making images bigger may break the rest of the table. Some plugins are adding new columns to products admin page and making it harder to tweek. I have 5 extra columns, 3 from yoast seo, 1 from theme and the last one is from facebook pixel. That’s why i needed to tweek with .column-name. If you have less than you can tweek with;

table.wp-list-table .column-name { 
    width: 15%;
}

Default is 22% and if it looks okey with 22% that remove this 3 lines or you may need to lower the width further.

Origen: How do I make WooCommerce product thumbnails bigger on the admin page? – Quora

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