Overview

You have set a background color for your app's UI Background Color, but the changes appear not to be saved because you see a different color in the Preview.

Solution

This issue occurs because there is a Header Background image set which is a solid color. The Header Background overrides the UI Bar Background Color.

1. Navigate to Design > Global Styling Tab
   
2. Scroll down to the Header Background and click the edit icon
   
   
   
3. Select the transparent image and click the Select button on the right
   
   
   
4. Click the Save button to save your changes

After removing the Header Background image, the UI Bar Background Color is displayed.