You can View a Coworker’s Calendar in Lightning Experience when co-workers share their calendar. For more, please review Share Your Calendar in Lightning Experience.
At times, the coworker's Event will only show you the following fields:
While the same event viewed by another user might see all of the event details.
This is expected behavior and occurs when the Event was created without any related records (such as the Name and Related To fields).
Events that don't have related records associated with them are considered Private. Only an Event Owner or Users with "View All Data" permissions can view the full details of these Activities.
Note: This resolution only applies to Parent Events.
When viewing events shared via Calendar, the texts in Description field may be formatted differently as they were entered (i.e. lost line breaks)
This is because the page is rendered differently when the user doesn't have access to the event's associated records.
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