Just add Moyenne to the Local Data Filer and move one of the sliders, first in - and then out, to select all data points (with values). Then all data points with values will be displayed - and regions without data will disappear.
A significant disadvantage of this approach: it is NOT dynamic.
The Data filter will stay as it is - once the data set gets updated, the plot will still show data with the previous limits.
better: add a transform column via right click /
with the formula:
Then use the local data filter to select