YITH Proteo theme supports sidebars. Different sidebar layouts may be used on each page/post/product of your website.

From YITH Theme Options > Sidebars you can choose the default layout of whole site and the layout and sidebar to use in the blog page. The blog page is where all your posts are listed.

Each page or post may have a different sidebar and layout. Read more about this in Page/Post options menu of this documentation.

Do you have an e-commerce website? Check Shop Options documentation menu to read more about sidebars in shop and product pages.