The early Apple Watch models lacked one important feature: an always-on display. This changed with the Series 5, which contains a display of polycrystalline low temperature oxide (LTPO). The option should not affect the battery life of the Apple Watch. Here's how to disable it.
Disable via the Apple Watch.
First, press the digital crown on the Apple Watch.
<img class = "alignnone size-full wp-image-441
Scroll down and select "Display and Brightness."
 Tap the "Always On" option.  Apple Watch Tip Always On ” width=”350″ height=”608″ src=”/pagespeed_static/1.JiBnMqyl6S.gif” onload=”pagespeed.lazyLoadImages.loadIfVisibleAndMaybeBeacon(this);” onerror=”this.onerror=null;pagespeed.lazyLoadImages.loadIfVisibleAndMaybeBeacon(this);”/>
Tap the switch next to "Always On" to turn off the feature.
Alternatively, you can keep the Always On display turned on and enable the "Hide Sensitive Complications" option g does not turn off the Apple Watch display, but no private information is displayed if the screen is not fully activated.
Disable via Watch App on iPhone  You can also disable the Apple Watch using the Watch app on your iPhone. Open the app "Watch" on your homescreen. Use Apple's Spotlight search to find the app.
Scroll down and then select "Display & Brightness".
Tap Always On.
Select the check box next to "Always On" to disable the Apple Watch screen.
<img class = "alignnone size-full wp-image-441366" data-pagespeed-lazy-src = "https://www.howtogeek.com/wp-content/uploads/2019/09/apple-iphone -watch-app-toggle-off-always-on.jpg.pagespeed.ce.T7Aw8NC4-W.jpg "alt =" Turn off Apple iPhone Watch App Always On  Again, you can hide the option "Delicate Complications" if the Apple Watch should not display private information when the screen is not fully activated.