Why does a Pro feature show me a preview?
Some locked Pro features open a short preview first, so you can see what they do. The Show Pro previews switch in Settings turns them all off.
On the free plan, some Pro features open a short preview when you tap them, before any talk of plans or prices. The preview shows what the feature does, so you can judge whether it matters to you. Comparing a run with similar past runs from the run summary is one example, and the compare and replay tools in Run Studio are others.
The × on a preview hides that one preview. To stop them all, turn off the Show Pro previews switch in Settings, under Tips & coaching.
Either way, your free features stay exactly as they were. A preview never blocks a free screen, and turning previews off only removes the extra look at Pro.