The blue beta target will replace the normal sideslip indication on the PFD during engine failure. Since the lateral normal law does not command the full needed rudder surface deflection, the pilot has to adjust the rudder pedals to center the beta target.
When the beta target is centred, total drag is minimized even though there is a small amount of sideslip. The calculation of the beta target is a compromise between drag produced by deflection of control surfaces and airframe drag produced by a slight sideslip. Centering the beta target produces less total drag than centering a conventional ball, as rudder deflection, aileron deflection, spoiler deployment and aircraft body angle are all taken into account.
Keep in mind that the yaw damper reacts to a detected side slip. This means that with hands off the stick and no rudder input, the aircraft will bank at about 5 ° maximum and then, will remain stabilized. Thus, laterally, the aircraft is a stable platform and no rush is required to laterally trim the aircraft. Control heading conventionally with bank, keeping the beta target at zero with rudder. Accelerate if the beta target cannot be zeroed with full rudder. Trim the rudder conventionally.