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It does work but it probably won’t show you the data you need to see.
- You need to first open the options menu in the block editor and switch off the full screen mode so the admin toolbar appears
- The information QM then shows you only relates to the initial page load; most of the content for the block editor loads in via Ajax requests to the REST API and QM doesn’t show you that information currently
In a future version QM will support showing profiling data for Ajax requests, but there’s no ETA for that at the moment.