In the newer versions of Oracle database, especially which are based on multi-tenant architecture the oracle engine differentiates between login from a CDB and a PDB through the port number which we use in the URL of the enterprise manager.
I tried to connect to oracle enterprise manager express in the oracle vm with 2 defualt users "system" and "sys" and the default password "oracle". But I can not find any tabs or buttons for administration purpose like old versions with different tabs like "availability", "Security", "Schemas"