Node-ui-microphone not visible on dashboard

I try to use browser mic with node-ui-microphone. I add node, add Tab and group in dashboard layout, and select group in node preference. But when I run dashboard I dont see mic button. Only empty screen and text:

Welcome to the Node-RED Dashboard
Please add some UI nodes to your flow and redeploy.

What I do wrong?

Node-red install on Raspberry. Dashboard run on PC browser Firefox 82.0.2

You should be able to see the widget in the dashboard... however it won't work if your browser is not on same machine unless you configure Node-RED to serve over a secure https connection (or run the browser on the same machine (localhost). This is a security policy enforced by the browser.