Admins cannot change or choose the homepage for employees. The homepage preference is a user-level setting, not an organization-wide setting.
The Workweek view on the Schedule tab is the default homepage, so employees can coordinate and work with others. Every workplace has its own policies, so Robin has a Workweek view permission.
By default, all users have access to the Workweek view. Robin admins can edit this permission under Manage> Roles > select user role > Workweek permission, in the "Admin management" section. To learn more about user permissions, see adding permissions to roles.
If you hide the Workweek view
If employees have the Schedule tab set as their homepage preference, they see the "My Meetings" tab by default, not the Workweek tab. For the best experience, ask your users to make the Map tab their homepage in their user settings.