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.
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.