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Using Red Shift Mode on the Venu 3 and Venu 3S Watch
Red Shift changes the display on the watch to shades of red to help preserve your night vision by blocking the colors of light that constrict pupils, and it can also reduce sleep cycle disturbances. You can use every feature of the watch while in Red Shift mode, including activities and the map, but it can reduce visible contrast on some screens. Red Shift can be enabled from the controls menu on the watch, or the display settings.
Enabling Red Shift
From the Controls Menu
To enable Red Shift, access the controls menu by holding the Light button. Select the eclipse icon 
to turn on Red Shift. To disable Red Shift, select the icon from the controls menu again. If you do not see the Red Shift icon, you may need to add it to your controls menu - search your owner's manual for customizing the controls menu.
From the Display Settings
NOTE: The Red Shift option will be listed as Red Shift, Orange Shift, or Green Shift, depending on the color you have it set to. The default setting is red.
Hold the bottom button.
Select Settings.
Select System.
Select Display.
Select an option:
During Activity
General Use
During Sleep
Select Red Shift.
Select Red Shift.
Select an option:
Off
On
After Sunset
With this enabled During Sleep, the watch will turn on Red Shift during your scheduled sleep times, and it will switch back to normal display settings after your scheduled time ends.
Color Options for Red Shift
There are three colors for Red Shift mode, red, orange, and green. This setting can be changed in the display settings of the watch.
Hold the bottom button.
Select Settings.
Select System.
Select Display.
Select an option:
During Activity
General Use
During Sleep
Select Red Shift.
Select Color.
Select an option:
Red
Green
Orange