What command is given in formation to allow Sailors to relax but not talk?

The appropriate command that allows Sailors to relax while maintaining silence is "At Ease." When this command is given, Sailors are permitted to shift their positions and adopt a more relaxed stance, but they must remain silent and attentive. This command maintains a level of order and respect within the formation while providing some relief from the rigidity of standing in formation.

Commands such as "Rest" and "Stand Easy" do allow for some level of relaxation, but they differ in the specifics of allowed behavior and posture. "Rest" typically allows for more freedom of movement, including talking, while "Stand Easy" usually implies a relaxed stance but still requires a form of attention. "Relax," while similar in intent to "At Ease," is not an official command used in military formations to achieve this specific behavior. Thus, the answer "At Ease" is the most accurate.