Thank you for reaching out. I can certainly understand our concern with the watch screen turning green and I would be happy to assist you further.
The first thing I would recommend would be resetting the watch. This will take the watch back to factory default settings. This also helps to resolve some minor symptoms you may be experiencing. I also would recommend not restoring from backup as it may include something that is causing the green tint on the screen. Give this link a try for steps to reset your Galaxy watch active 2: https://www.samsung.com/us/support/answer/ANS00084702/
If you have tried resetting the Galaxy active 2 and are still experiencing these symptoms, I would recommend a service repair. If the device is in warranty, please feel free to reach out to us directly via one of the following options and include a link to this thread.
1. Facebook Messenger: http://m.me/samsungsupport
2. Twitter: https://twitter.com/messages/compose?recipient_id=18768513
3. Or you can use the following link below to request service. https://www.samsung.com/us/support/service/
4. Private message: https://bit.ly/3fbRevo
If the device is out of warranty, I would recommend reaching out to our customer service team directly at 1-8000-726-7864 for the next best steps on getting your device set up for service.