1. Click on hamburger icon.

2. Click on dashboard tab and open Line Chart in edit mode.

3. The Edit menu box appears as you click on Line chart icon. And a widget gets added in content place automatically in dashboard.

4. In Formatting Property click on General. In General click on Chart Sorting based On Value.

Select Sort Type - Ascending, As Shown in below figure

5. Click on Preview and Save and Exit.

6. Now, match your Line chart with the below example, it should look like the figure below: