Status bar & Navbar color on Android 15+
On Android 15+, the status bar and navigation bar colors can no longer be customized (changed) via an extension (such as TaifunTools) since App Inventor released the new targetSdkVersion 35 yesterday (August 17, 2025). Customization can only be made in the AI2 designer via "Project Properties" > "Theming" > "PrimaryColor." However, this will customize the status bar and navigation bar with the same color at the same time.
This might be a challenge even for our top extension developers. 
@Taifun @Kumaraswamy @Patryk_F @ etc... → @extension_developers
Brief explanation:
On Android 15+, apps are displayed in "edge-to-edge" mode: The app content extends across the entire screen, and Status bar and Navbar become (semi)transparent. Methods like window.setStatusBarColor() or window.setNavigationBarColor() are ignored.