Sometimes in Looker Studio, some metrics displays Null in a charts instead of a zero. But this can be avoid and you can choose what to display between a range of choice.
We will cover it in this article.
Missing data configuration:
Every charts has a configuration for the missing data. It is called Missing data and is located in the Style section. To access it, follow these steps:
Go to the Style column and locate the Missing data section.
Click on the dropdown and select a value. You can choose between:
"no data"
"0"
"-"
"null"
" " (blank)
Adapt it to your situation and remember that you can edit it at once for several charts.