Last absolute visible surface index, e.g., -1 when no entries are visible.
This numeric value (int32) belongs to FInteractionRuntimeResolvedSurface under InteractionRuntime.
Designers configure this value in the owning asset or object details panel, while Blueprint logic can read the resolved value at runtime.
UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "InteractionRuntime")
int32 VisibleEnd = -1;