The Agent Activity section gives you a tabulated view of all the actions your Agent's did on a particular date.

Access this section by clicking on the ⋮ in the Navigation Panel, and selecting the Agent Activity option:

You can select a specific date and define if you want to see the activity for All Agents, or select Agents by name and the activity will be displayed to you in a table:

Changes made through the Admin interface are not shown in this section, but are logged in Admin > Agent > Audit Log.