The zwave tweaker was updated for the 2021 version of the app, but still requires the groovy cloud, so it will go away when the cloud does in a few months. But it should work for now. Did you try that version? Here’s a direct link.
Also, what’s the brand/model of your device? Many battery-powered devices can’t be reconfigured on the fly, only when they first join the network, so the tweaker doesn’t work with those.