You want to delete the notifications you have received and can not find an option to delete it.
Accordingly with the system behavior the notifications that were already generated can not be deleted.
This is the expected system behavior.
You can check the settings and deactivate notifications in order to generated only essential notifications in future.
If you need to delete the notifications, you may contact your implementation manager to help with such request or approach directly the SAP Cloud Service Center (firstname.lastname@example.org).
Note: The services of the SAP Cloud Service Center will be charged as packaged services based on fixed prices.
An alternative option may be to check the SAP Hybris Cloud for Customer Ideas Forum to submit an idea: https://ideas.sap.com/SAPCloudforCustomer
KBA , SRD-CC , Cross Components , How To