Cross-platform apps handle differences in UI/UX across multiple platforms through several strategies:

1. Platform-Specific UI Components: Many cross-platform frameworks, like React Native and Xamarin, provide access to platform-specific UI components. Developers can use these components to ensure that the app's UI conforms to the design guidelines and user expectations of each platform.

2. Custom Styling and Theming: Cross-platform frameworks often allow for custom styling and theming to create a consistent look and feel across different platforms while still accommodating platform-specific design elements.

3. Responsive Design: Using responsive design principles, developers can create layouts that adapt to different screen sizes and orientations. This ensures that the app's UI remains functional and visually appealing on various devices.

4. Conditional Rendering: Developers can use conditional rendering techniques to show or hide certain UI elements based on the platform, allowing for platform-specific optimizations and enhancements.

5. Testing and Iteration: Thorough testing across multiple platforms is crucial to identify and address UI/UX discrepancies. Developers can use emulators, simulators, and real devices to test the app's performance, functionality, and user experience on different platforms.

By employing these strategies, cross-platform apps can effectively manage differences in UI/UX across multiple platforms, providing users with a consistent and intuitive experience regardless of the device they use.