Activity Logs is available under Administration



Logs viewer is available under the Administration tab


The activity logs contain every logs on the creation, change and deletion of objects by the users


Enable Logging

In Administration->Settings, check the Enable Activity Logs box 

Note that by enabling the logging, the performance of your system may slow down due to additional database accesses


View the logs

Go Administration->Logs



You can filter the logs in the left panel, or search them by description.