Your appointments by its subject or location information by setting Prevent someone from seeing your whereabouts or hints about any of Anyone else would just see your availability times. Via the “Add…” button, you can add some colleagues or your manager to still allow them to see some more details. Change its Permissions Level to “Free/Busy time”.Next, select the View tab at the top of the screen and click on the View Settings icon, found on the toolbar. Right click your calendar folder and choose Properties. Open Outlook and switch to Calendar view.Currently it is probably set to “Free/Busy time, subject, location”. To do this, set the default permissions for your Calendar to “Free/Busy time”. To prevent that any details of your Calendar is exposed via the Schedule Assistant, you can change the permissions on your Calendar folder. Change permissions on your Calendar folder Note: In Outlook 2010, Outlook 2013 and Outlook 2016, this command is also available on the Appointment or Meeting tab when you select the item in the Calendar folder so you won’t have to open the item first via a double click. In Outlook 2007 and later, all Private items will show with a lock icon in the Calendar: In Outlook 2003 and previous, all Private items will show with a key icon in the Calendar: In the Tags group on the Appointment or Meeting tab, click the “Private” button with the lock icon.
To prevent co-workers from seeing details via Free/Busy times, you can either publish your appointment as Private or you can change the permissions on your Calendar folder. When co-workers plan a meeting and are looking at free/busy times via the Schedule Assistant, they can see the details of any appointment if they hover the mouse pointer over the appointment.