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> simply there is no about us page in the demo install, there are only categories and products.

Prior to 1.5.8, about_us was a plugin.

1.5.8 has a built-in about us page, which can be reached using the URL

index.php?main_page=about_us

Whether this page is linked in the Information Sidebox is determined in 1.5.8 by the site specific overrides file.

https://docs.zen-cart.com/user/custo...fic_overrides/

Whether or not this page is shown elsewhere in your site is determined by your configuration and template.