Hi,
There are two weekly scheduled reports & seven pre-defined notifications configured by Symantec.
Schedule Reports: SEPM --> Reports --> Scheduled Reports
Notification location:
SEPM--> Monitors--> Notifications --> View Notifications --> Notifications Conditions
If you wish you can delete these notifications & reports however it's not recommended.
Notifications are trigger only when there is a problem.
Check whether do you have any extra reports and notifications configured? if not required delete them.
Check which reports are creating extra noise & tune it them as per business requirement.
Those reports are commonly required by Company System admin's so Symantec is giving as a pre-defined.