Question:

How can I fix the issue of unable to turn on Blue Light Filter on my Samsung phone?

Answer:

If the Color Adjustment option is enabled in your phone Accessibility settings, the Blue light filter will not work. To enable the Blue light filter, you will need to disable Color Adjustment. Please perform the following:

1. Navigate to Settings, and then search for and select Color adjustment.
   
   
2. Tap the switch to disable Color adjustment. Now the Blue light filter should be available.
   
   
3. To turn on the Blue light filter, swipe down from the top of the screen to open the Quick settings panel. Navigate to and tap Blue light filter. The icon will be illuminated blue when it is turned on.