Oracle EM

For old flash technology with all tabs and functions:

SQL>@?/rdbms/admin/execemx emx

NB: clear cach of Browser

Revert back for new Java JET technology but with only one tab (Performance)

SQL>@?/rdbms/admin/execemx omx

https://medium.com/@FranckPachot/19c-em-express-aka-oracle-cloud-database-express-dfd666911bed

and in doc:

https://docs.oracle.com/en/database/oracle/oracle-database/19/upgrd/behavior-changes-deprecated-desupport-oracle-database.html#GUID-3BAFD95E-4D00-4F0F-BC80-6064F497F878