Hi @rasmoodi
That demo has a few premium modules in it, but the best way to see what it looks like on your site is to do exactly what you have done — install the free version.
This is because every theme is different, and the plugin picks up the styling from your theme.
You can change some of the things in the plugin settings under Directory > Settings > Appearance, but most times you’ll do that in your theme settings or with custom CSS. While all fonts, colors and spacing can be changed using custom CSS, providing exact code here is beyond the scope of support we can offer. Here is an article about how to use custom CSS with Business Directory in a way that doesn’t get overwritten on upgrade of BD: https://businessdirectoryplugin.com/knowledge-base/how-to-use-custom-styles-with-bd/
If you aren’t familiar with CSS, you can start reading up on it here: https://www.htmldog.com/guides/css/beginner/
I hope that helps. Please let me know if you have any other questions or issues!