Audit log

In this screen you can see the history of various actions executed in ELA. The logs are ordered in timely order from the latest to the oldest events. You can revert the order by clicking the label of Time column.
Some of the logged actions are as follows:

login, logout - The action of logout is recorded only if the Logout button was used to exit ELA.
generating, downloading  or removing an offline license file
viewing the details of a legacy license file
authorization offer
cancellation of authorization offer
acceptance, refusal of authorization offer
cancellation of authorization
changing settings
registration of a security admin account, confirmation of registration
password change
seat deactivation
activation, dissociation of a unit

For some of those actions there is more information available in the Description column if you hover the icon_information icon.

For example, if you changed the settings, then hovering the icon_information icon in the Description column would show you the new settings applied during that change.