To change the Wi-Fi network your Google Chromecast is connected to, follow these steps:
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Access the Settings Menu: From the top right corner of your TV screen (where the Chromecast interface is displayed), select Settings. This is usually represented by a gear or cog icon.
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Forget the Current Network: Navigate to the Wi-Fi settings. Locate the name of the Wi-Fi network your Chromecast is currently connected to. Select the network name, and then choose the option to Forget network.
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Set Up Chromecast on the New Network: After forgetting the previous network, you'll need to go through the Chromecast setup process again to connect to your new Wi-Fi network. You can do this using the Google Home app on your smartphone or tablet. Follow the on-screen instructions to connect your Chromecast to the new Wi-Fi network.
Essentially, forgetting the old network and re-setting up the Chromecast with the Google Home app on the desired new network achieves the Wi-Fi change.