Can I have multiple webview instances in one scene?

Yes! You can use 3D WebView to place multiple webviews in a single Unity scene. Here are some approaches you can take to achieve that:

On most platforms (Android, Windows, macOS), 3D WebView is able to handle multiple webviews efficiently without a loss of performance. On these platforms, the performance overhead of each additional webview is akin to opening a new browser tab. On iOS and Universal Windows Platform (UWP), 3D WebView is not as performant due to limitations of those platforms. As a result, creating additional webviews on iOS and UWP has a performance greater impact.