How to see the temperature polyline in the ink weather app 15 daily forecast?

It's easy to see a line chart. Open the ink weather app, slide down and find the words 15 day forecast. There are two smaller words "column" after these words. Click on the mark at the back, and you will see that there are two choices: column and polyline. Just choose the broken line. The line chart shows more clearly whether the temperature is rising or falling, which is clear at a glance.