How to exclude abnormal data points in a chart?

When you create a chart on analysis screen, you can exclude any datapoint which are outliers or anaomolies. For example null values from the chart, or negative values of age. In order to do so you have to click on the particular datapoint in the chart area which will open a small box.

It will have option to exclude in the form of cross mark. You can click on the exclude option and the chart will change by removing the datapoint which is excluded. Basically in the background it is applying filter on the data with the exclude conditions.

In order to undo the operation we can simply trace it back and remove it from filter option.