Theme Prime substratum runs on Android 7.1. + ROM with full supportum WHO. This theme can also work on some inheritance limitation.
There are many options in the theme to change the primary, accent and background colors to change the appearance or layout on an application. Use the Priorities tab on the substratum application to organize the overlay.
Before applying a theme, go to the tab substratum for recovery and click Restore theme and choose Disable or Uninstall Overlays. This will ensure when you install the theme properly