You may have created teams to cluster several departments or locations within your company for example, where you don't want team members to see survey results for this specific team.
You can disable this under 'Company' > 'Employees' > 'Actions' > 'Manage Teams'. Alternatively, 'Settings' > 'Company' > 'Departments, Business Units, Divisions, Teams'. There, click on a team and navigate to the advanced settings of the team. You can exclude the team from being displayed in the survey results by unchecking the box 'Show in team filter in analytics across the platform'. This will also apply to other Analytics tabs, such as Review Analytics.