Module located: Control Panel => Marketing => App Color Settings
If you are app is on version 6.0.0 or higher, then the following settings will change the colors in your Web app, Android app, and iOS app.
Primary Text Color- This controls the main text throughout the app such as: Titles, Bold Text, etc.
Secondary Text Color- This controls any subscript text, description text, etc.
Primary Background Color- This controls any foreground background colors and will be the most prominent background color.
Secondary Background Color- Anywhere the primary background color is not shown, the secondary background color will be behind it. It is recommended to be a slightly darker shade of the primary background color.
Theme Color- This will be the most dominant color throughout the app and is used anywhere that needs a color and doesn't fall into the above categories.
Please use below screenshot as reference: