A system comprising: a memory storing instructions; and a processor communicatively coupled to the memory and configured to execute the instructions to: access head presence data generated by a head sensor included in a user control system of a computer-assisted surgical system, the head presence data indicating a presence or an absence of a head of a user within a vicinity of a viewer console included in the user control system; access eye tracking data generated by an eye sensor included in the user control system, the eye tracking data indicating whether an eye of the user is gazing through an eyepiece at a display device included in the user control system; direct , if the head presence data indicates that the head of the user is present within a vicinity of the viewer console and the eye tracking data indicates that the eye of the user is gazing through an eyepiece at the display device, the user control system to operate in a first operating mode; and direct , if the head presence data indicates that the head of the user is present within the vicinity of the viewer console and the eye tracking data indicates that the eye of the user is not gazing through an eyepiece at the display device, the user control system to operate in a second operating mode different from the first operating mode. a memory storing instructions; and a processor communicatively coupled to the memory and configured to execute the instructions to: access head presence data generated by a head sensor included in a user control system of a computer-assisted surgical system, the head presence data indicating a presence or an absence of a head of a user within a vicinity of a viewer console included in the user control system; access eye tracking data generated by an eye sensor included in the user control system, the eye tracking data indicating whether an eye of the user is gazing through an eyepiece at a display device included in the user control system; direct , if the head presence data indicates that the head of the user is present within a vicinity of the viewer console and the eye tracking data indicates that the eye of the user is gazing through an eyepiece at the display device, the user control system to operate in a first operating mode; and direct , if the head presence data indicates that the head of the user is present within the vicinity of the viewer console and the eye tracking data indicates that the eye of the user is not gazing through an eyepiece at the display device, the user control system to operate in a second operating mode different from the first operating mode. access head presence data generated by a head sensor included in a user control system of a computer-assisted surgical system, the head presence data indicating a presence or an absence of a head of a user within a vicinity of a viewer console included in the user control system; access eye tracking data generated by an eye sensor included in the user control system, the eye tracking data indicating whether an eye of the user is gazing through an eyepiece at a display device included in the user control system; direct , if the head presence data indicates that the head of the user is present within a vicinity of the viewer console and the eye tracking data indicates that the eye of the user is gazing through an eyepiece at the display device, the user control system to operate in a first operating mode; and direct , if the head presence data indicates that the head of the user is present within the vicinity of the viewer console and the eye tracking data indicates that the eye of the user is not gazing through an eyepiece at the display device, the user control system to operate in a second operating mode different from the first operating mode. <EOS>