You are using GDV2 and have posted in the incorrect forum.
Please post all GDV2 issues to an appropriate GDV2 subforum so we know how to advise you.
If you wish to change the style of listings you can change your theme settings, for example, for the font.
If you wish to customize the listings, so that they are markedly different than your theme, then you will need to use custom CSS.
You can find some common examples of custom CSS here, including examples for targeting the Archive Item post_content.
https://wpgeodirectory.com/docs-v2/faq/common-examples/
To remove the map, remove the GD Map Widget from the sidebar.
Please be sure to click through our documentation for GDV2, as it is is essential reading for an understanding of how GDV2 page design works.
https://wpgeodirectory.com/docs-v2/geodirectory/getting-started/
https://wpgeodirectory.com/docs-v2/geodirectory/page-design/