If a content author cannot edit a company webpage, which tool should be used to check their access rights?

The Access Viewer is the correct tool to check a content author's access rights because it specifically allows users to view and assess the permissions assigned to various items within Sitecore. By using the Access Viewer, administrators and content authors can analyze and determine the precise permissions a user has concerning a particular item, such as a company webpage.

This tool displays a detailed overview of the roles and rights associated with the item, making it easier to diagnose why a content author may not have the ability to edit. It provides insights into the inheritance of permissions from parent items and any specific access rights that might have been denied or overridden.

In contrast, other options like the Content Editor focus primarily on the creation and editing of content rather than managing or reviewing security settings. The Security Editor is more about adjusting user roles and permissions rather than merely viewing them, and the Item Manager is primarily for organizing and managing items, not necessarily for reviewing access rights. Therefore, when the objective is to ascertain why a content author cannot access or edit a specific webpage, the Access Viewer is the most suitable and effective tool to utilize.