JMeter Scripter
Pro mode includes the JMeter Scripter — a faithful view of the JMeter test tree for power users. Edit samplers, add correlations and assertions, tune timers, and build multi-flow tests beyond what the Easy size-picker exposes.
Scripter and Easy share the same journey data and the same runner — opening a test in Pro just shows more of the pipeline. Use Back to Easy to simplify again.