You can edit the number of posts visible on your website in your website set up section.
Click on the website you would like to edit.
1. You can edit the Maximum Visible Articles.
2. Choose when an article will automatically delete off your website.
3. Adjust the size of the images for the articles preview.
4. Select if you would like the image preview to be from the article or your brand logo.
5. Adjust where the article link will take the person who clicks.
6. Click save on the bottom left once you made the required changes.