The audit log
A firm-wide record of what happened, when, and who did it. Owners only.
The audit log answers questions after the fact. Who approved that document. When did that go to the client. What happened to this engagement last Tuesday.
Getting there
Your settings, under the audit log. It is owner-only, because it covers everyone in the firm.
What is in it
Firm-wide activity with filters, so you can narrow to a person, a kind of event, or a stretch of time instead of scrolling.
Audit log or activity record?
Your team settings have a lighter who-did-what panel that any teammate can read. The audit log is the full, filterable, owner-only version. See assigning work and seeing who did what.