In Qlik Sense, you can show a null value in a chart by using the built-in "null symbol" feature. Here's how you can do it:
Open the chart in edit mode by right-clicking on the chart and selecting "Edit". In the right hand tab, scroll down to the "Data" section. Under "Data," find the dimension you want to include null value. You can choose to show a symbol for null values, such as a dash, or you can choose to ignore the null values entirely by selecting "None". If you choose to show a symbol, you can also specify the symbol you want to use. Save the changes to the chart and preview the result.
