One way is by using a tool like Adspower, which helps you manage multiple profiles and devices. In Adspower, you can create a fresh, fake device profile that masks details like your OS and browser information, making it seem like you're using a different system. Once you log in to Gmail, Google will trigger the "1 session on an unrecognized device" notification, as it won’t be able to recognize the profile. Just make sure to clear your cookies and cache for extra security. This way, you'll keep your real device and OS hidden while maintaining your work setup.