Question:

All colors on screen are grayscale unexpectedly.

Answer:

• If you activated Bedtime mode, all colors on the screen are displayed by grayscale tone.
• You need to check if you enabled Bedtime mode. On Settings, tap Digital Wellbeing and parental controls > Digital Wellbeing, and check switch of Bedtime mode or Turn on as scheduled
• Bedtime mode allows you get ready for bed by changing the screen to grayscale and muting calls, alerts, and other sounds.
• Thus, you can activate bedtime mode to reduce eye strain before sleeping and prevent your sleep from being disturbed.
• Turn on as scheduled : Set the device to turn on the bedtime mode as scheduled.

Note: Dark mode (Settings > Display > Dark mode) also can reduce eye strain by applying the dark theme when using the device at night or in a dark place. The dark theme may not be applied in some apps and Home/lock screen.