If you don’t see this in your navigation, your administrator can switch the module on under Administration → Modules, or it may not be included in your plan.


The header and warnings
Retention
How long a file is kept, and what happens when the time is up. Legal hold suspends expiry entirely — a file under one is kept whatever its policy says, until the hold is lifted.
Add opens New retention policy; clicking a policy opens it for editing.


Categories
A category is not a folder — it hands its retention policy to everything filed under it, and can demand approval before a document counts as current, or an expiry date after which it does not.
Add opens New document category:

