Early Apple Wach models lacked one significant feature: an always-on display. That changed with the Series 5, which includes a low-temperature polycrystalline oxide (LTPO) display. The option shouldn’t affect the Apple Watch’s battery life, but here’s how to turn it off.
Disable It from the Apple Watch
Start by pressing the Apple Watch’s digital crown.
Locate and tap on the “Settings” app. The icon looks like a gear.
Scroll down and then select “Display & Brightness.”
Tap on the “Always On” option.
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Source: How-To Geek
