It is not possible to configure sharing settings within this app itself. We apologize for the inconvenience.
S Calendar is designed to link with accounts from other calendar services, such as iCloud Calendar or Google Calendar, to display schedules within this app.
Many of these calendar services offer features that allow you to share schedules with family members, colleagues, or acquaintances. Please consider using those features.
Here is the link how to share the iCloud calendars. Please see it.
Share iCloud calendars
And if you use Google Calendar, please see this link.
Share Google Calendars