diff --git a/src/pages/workouts/components/WorkoutItem.vue b/src/pages/workouts/components/WorkoutItem.vue
index 69afbe9..b396029 100644
--- a/src/pages/workouts/components/WorkoutItem.vue
+++ b/src/pages/workouts/components/WorkoutItem.vue
@@ -434,7 +434,12 @@ const getUnit = (label: string) => {
 };
 /** Computes "Данные участка" over every metric for the given point range. */
 const computeAreaData = (start: number, end: number) => {
-  markedCoordinats.value = lineCoordinates.slice(start, end);
+  // The purple line on the map is shown only for a real sub-range;
+  // a full-range zoom keeps "Данные участка" but highlights nothing.
+  markedCoordinats.value =
+    start > 0 || end < lineCoordinates.length
+      ? lineCoordinates.slice(start, end)
+      : [];
   let avgData: AvgData = {};
   for (const config of chartConfigs.value) {
     const values = config.data.datasets[0].data.slice(start, end);
@@ -832,6 +837,7 @@ const buildChartOptions = (
         activeSection.value = null;
         group.resetAll();
         areaAvgData.value = {};
+        markedCoordinats.value = [];
         return;
       }
       activeSection.value = sectionNo;
@@ -1064,6 +1070,7 @@ const resetChartZoom = () => {
   group.resetAll();
   activeSection.value = null;
   areaAvgData.value = {};
+  markedCoordinats.value = [];
 };
 </script>