From the topology view, select the quarkus-todo-app node, then go to Resources tab on the right panel. And then click View logs for the Pod that you need to view its logs.
View logs
You should be able to see the logs from application.
View logs
OpenShift comes with logging stack (EFK) out of the box. So, you can view the application logs in Kibana as well by just click on Show in Kibana link.
View logs
Kibana dashboard should be opened and display application logs.