Apple watch face open
How do I keep my watch open/alight all the time?
Apple Watch Series 6, watchOS 9
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You can use the Always On Display feature, but you cannot keep the face fully open all night. Even while being charged, the face is designed to either go off completely while charging or if not being charged, dim to Always On (with reduced brightness) after either 15 or 70 seconds.
Use the Always On feature with your Apple Watch – Apple Support (UK)