The Azure ATP security operations experience (such as alert management, user investigation and new security assessment reports) for Azure ATP can be performed also under the Microsoft Cloud App Security Portal (under portal.cloudappsecurity.com).
Note that you don’t need to have a license or not have to use Microsoft Cloud App Security in order to enjoy from this experience for Azure ATP. You can read more about the integration here: https://docs.microsoft.com/en-us/azure-advanced-threat-protection/atp-mcas-integration
Among many other features and capabilities, this portal includes a number of user actions available from the user page, including the ability to suspend a user. You can find more details about the new user page and capabilities here: https://docs.microsoft.com/en-us/cloud-app-security/tutorial-ueba