Samsung Galaxy S6 Edge: How to Fix Cannot Enable Icon Backgrounds Feature in Android 6.0.1 Marshmallow

A couple days back, an insider named Tony sent me an email to ask why the icon backgrounds option in his Samsung Galaxy S6 Edge was grayed out so he couldn't use it to make icons in home screen and app screen became stand out by displaying them with shaded background. FYI, this option will be unavailable or grayed out when you're using other theme in your phone. Thus, to make this option available, you have to revert theme in your phone back to default.


How to enable the default theme?
As the example, we'll enable the default theme when the phone is using the Gold n Black Platinum theme by using the following steps:

1. On any screen, swipe down the top of the screen to open up the notification panel and then tap to go to the settings menu.
   
   
2. Scroll down the screen to find Themes and then tap it.
   
   
3. Tap the Default thumbnail to revert theme back to the default.
   
   
4. Tap Apply button to apply the default theme to your phone.
   
   
5. Once done, the icon backgrounds option will be available and you can use it to display icons in the home screen and apps screen with shaded background to make them more stand out.