Go to admin panel, Then Extensions → Templates. Select the template → select option tab → Then select layouts. By default Layouts will select default layout.
You need to select your layout override first because layout override depend page layout setting.
Select your layout which you want to change layout color (because layouts only affected with selected layout override. For more information: https://bdthemes.com/support/knowledge-base/understanding-about-layout-of-warp-framework/)
By default layout color default will be selected, if you want layout another color so you need to select color from below dropdown.
Then click save and close button for save your settings.
For more help you may follow the link: https://bdthemes.com/support/knowledge-base/change-color-style-for-specific-page/