You can set when to display Always-on display items.
You need to enable Always-on display first. See Enable Always-on display for more information.
1.Go to
Settings > 
Always-on display & Lock screen > Always-on display > Display items.2.Choose For 10 seconds after tapping , Always , or Scheduled.
Tip
You can tap
to enable Turn off when Battery saver is on to reduce power con- sumption.