You can control whose calendars employees can view in Sage HR. You can set it so that either an employee can:
Only see their own calendar
Only see calendars of members of their team
See everyone's calendar
This is controlled in Employees permissions in Settings.
Click on your name on the top right, then click Settings.
On the Settings menu, click Permissions, then click Employees.
Under Employee permissions select the access you want them to have.
Scroll down then click Save.