如何在Magento的类别部分更改所列产品的顺序

I have some products which have a category. All products belonging to category are listed in category section in magento as shown below-

Here all products are listed in DESCENDING order of their IDs. but I want to listed them in ASC order by 'Postion' column like below-

how can I do this.? Do I need a plugin for that or it could be done by changing in some files.