How do I turn off noise cancelling on Bose QC?

Bose QuietComfort (QC) headphones have earned a reputation for their exceptional noise-cancelling capabilities, immersing users in an oasis of tranquility while enjoying their favorite music or podcasts. However, there are instances when it is necessary to disengage the noise-cancelling feature. Whether you wish to be more aware of your surroundings, conserve battery life, or simply