Hi @Hogehoge. I am afraid there is no first-class way to investigate costs within a workshop app… We had a discussion about exactly this in belows thread where I also describe my typical (very painful) approach on how to investigate. In a nutshell I create a copy of my workshop app → perform a specific set of steps I would like to understand the costs → wait one day → check resource manager. Ideally, the compute seconds would be part of the profiler view or workflow lineage. however I have the feeling there might also not be too much appetite to develop features (beyond minimal required) that help us save costs 
*cough***
https://community.palantir.com/t/workflow-builder-functions-compute-usage/3400/2?u=phil-m