setSupportMultipleWindows flag works for android only if u want to enable muliple screens in ios as well then u need to enable useWebView2 to true that detenmines whether the web view should use the new chromium based edge webview and enable javaScriptCanOpenWindowsAutomatically to true. I hope it will help you to fix this issue

useWebView2={true}

javaScriptCanOpenWindowsAutomatically={true}