Knowledge Guru Theme provides all common WordPress post features and functionality, as well as some additional features and customization as described below. In the customizer, go to the Appearance -> Customize -> Theme Options -> Blog -> Single Post section to manage the settings for your single posts.
Have in mind that you should keep one of your single posts open on the right, in order to see the live changes that you make.
This theme is WordPress 5 optimized, which means that it uses blocks for content creation. If you want to learn more about WordPress blocks and their features, we suggest you visit this great user guide for using blocks.