There are several ways to edit a test. 'Quick edit' or 'Launch Trainer'. But if you want to change anyhting in a specific flow, I have to go to Flows, click on the 'i' to know where the flow is used, click on a test, click on edit steps and select Quick Edit. Now I see my test with the specific flow and I can change it.
It would be way quicker if you go to the screen with the Flows and have a possibility to Quick Edit your flow (iso quick edit you test to see your flow)