Display post content

I would like to display part of the post content as well so I would be able to limit the number of characters is the maximum that way the user can click on the ‘read more’ what would redirect him to the post page. Kind of like what it is on facebook when you click on ‘Keep reading’. I couldn’t find an option for that on the widget. Is there a way I can customize this on the plugin via PHP if it doesn’t have that option already?

https://wordpress.org/plugins/category-feature/