There are two options to manage this settings in ePortal. Firstly, you need to check the settings if it is managed by Admin or Manager as follows:
Log in to ePortal as admin.
Go to Settings, click eLeave Settings, select Configuration.
Check if the settings are managed by Admin or Manager at the Calendar Settings.
If the setting is managed by Admin, then the admin needs to manage the setting here to allow the employees to view each other's leave.
If the setting is managed by the Manager, then the respective employees need to request their manager to set the setting as below:
Log in to ePortal as manager.
Click Organizer, then click Delegation.
Choose the option among the three that you would like to allow your subordinate to view.
Click Save.