Final answer:
In Microsoft Dynamics 365's Field Service module, the preferred resource for a Field Service Agreement is defined in the Booking Setup. This is where you can align certain technicians or teams with specific work to be scheduled, while the Field Service Settings are for default configurations.
Step-by-step explanation:
To define the preferred resource for a Field Service Agreement in a Microsoft Dynamics 365 environment, one should navigate to the Booking Setup tab. This is where you can specify which resources are preferred for specific types of work. Remember, Field Service Agreements are used to set up and maintain a series of service visits over time, and by selecting the preferred resource, you ensure that a certain technician or team is chosen first when the system schedules the work order created from the agreement.
It is important to note that while you can set up default preferences within the Field Service Settings, individual preferences for specific work orders or agreements are typically managed in the Booking Setup. The Schedule Board Setting and Scheduler Field Service slot text template do not control preferred resources directly; they rather determine how bookings are visualized or how schedule slots are defined on the schedule board.