To design a GUI that supports multiple blockchain networks, consider the following:

1. Modular architecture: Design a modular GUI that can easily integrate with different blockchain networks.

2. Network-agnostic components: Create components that can work with various blockchain networks, such as wallet management or transaction tracking.

3. API-based integration: Use APIs to connect to different blockchain networks, allowing for easy integration and switching between networks.

4. Customizable network settings: Allow users to configure network settings, such as node URLs or chain IDs.

5. Network-specific features: Incorporate network-specific features, like Ethereum's smart contract support or Bitcoin's Segregated Witness (SegWit) functionality.

6. Cross-chain compatibility: Support cross-chain interactions, like atomic swaps or cross-chain bridges.

7. User-friendly network selection: Provide an intuitive way for users to select and switch between blockchain networks.

8. Real-time network updates: Display real-time updates and notifications for each supported blockchain network.

9. Scalability: Design the GUI to scale with the addition of new blockchain networks.

10. Consistent user experience: Ensure a consistent user experience across different blockchain networks.

By following these guidelines, you can create a GUI that supports multiple blockchain networks, providing users with a flexible and versatile platform for interacting with various blockchain ecosystems.