Figured is a collaborative tool aimed at bringing the whole farming team together. 

In the case of multi-farm (multi-enterprise), it can oftentimes be a pretty large team that needs to be added into the one Figured farm, and with multi-farm (multi-enterprise) specific permissions it means that farm manager A can sort out their side of things - without seeing farm B's planning and reporting.
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To enable a user for multi-farm (multi-enterprise) permissions, you first need to invite them to the farm.

Once you've done that, head into their user under Settings > People and from there you can set their access on a per farm basis.

These multi-farm permission levels will flow through to all parts of the farm - dashboard, trackers, planning, and reporting.