To uninstall a system app, you'll need to enable Developer Options on your device. This can be done by going to Settings > About Phone > Build Number and tapping on it seven times. Once you've enabled Developer Options, you can navigate to Settings > Developer Options > -root access or ADB to uninstall system apps.
How to Uninstall System App Updates on Xiaomi Android | Revert System
Keep in mind that uninstalling system apps can have unintended consequences, such as breaking other apps that rely on them. It's essential to research the app you want to uninstall and understand its dependencies before proceeding. If you're unsure about uninstalling a system app, you can always disable it instead, which will prevent it from running in the background and consuming resources.