Can members of one group view reports from another?

Yes! Report view settings are entirely customizable, so you can choose exactly who sees who's reports. Or you can select Group permissions such as Group View or Drilldown to enable sharing among team members.

Here's a quick primer on the types of permissible viewers:

Reviewers

Your Reviewer is the person who is assigned with the task of reviewing your reports on a regular basis. They are generally your supervisor, or the person who moderates feedback for your team.
Learn how to set a Reviewer

Group Viewer

Your coworkers can also see your reports IF they are granted access through Group settings. This is called "Group View", and it's more of a forum style structure that allows all individuals within a certain group to view each other's reports.
Learn how to enable Group View

Request to View

Other users can also request to view your reports, regardless of their grouping or position within the company. This is called "Viewing", and requires your permission before reports will be shared.
Learn how to View another user