Display posts of a category in a page with the same theme design

Hi al_isbani. My recommendation would be to use a plugin like List Category Posts. It offers a shortcode you can place anywhere on the page. It won’t be the same layout as the theme but will be a whole lot easier than figuring out how to modify the theme files. Or you could create a custom page template and make a copy of that template for each category, then list those pages in your menu instead of the categories. But then you’d have issues with linking to that category page in other places in the theme that use categories.