Team-wide access is used for groups of users. When adding a new user, you could assign them to a group, such as a sales team, or a marketing one. Then, with team-wide access, you can segregate leads by the group.
For example, if a user is in the sales team group, with team-wide access the user could see all sales team pipelines, but they would not see the marketing team pipelines. Or, in this use case, the users in the marketing team could see all leads assigned to a user of the marketing team group, but they would not see the leads assigned to members of the sales team.
To set up team-wide access, select the settings needed and check the Team-wide access setting. Next, set up access to the right pipelines by either denying or allowing access to them. All pipelines are located at the end of the list:
To learn how to create groups, read our How to create groups article.