Once you paired/joined a Zigbee Router device the routing function will work automagically, (each device will evaluate its best connection options and if needed automatically move around once every 24-hours to the best Zigbee Router devices), see → Zigbee networks: how to guide for avoiding interference and optimize for getting better range + coverage
ZHA configuration UI has a tab to view visualized device links in your Zigbee network topology, but you do not have to do anything → https://www.home-assistant.io/integrations/zha#zigbee-network-visualization-in-zha-ui