How to Show full posts on Homepage?

This is how your theme is set up. For help with your paid/commercial theme, please contact the author through https://themeforest.net/item/newspaper/5489609/support

If you have tried doing so in settings and it has made no difference then you might be best contacting ThemeForest as they develop the theme that you use. It might end up being that your theme does not support showing full post content.