I have data points from a CSV-file that I opened in QGIS.
The points illustrate different power plants of solar, wind, geothermal, coal, oil, etc with different capacities within each class.
I already categorized the symbols by opening the
Layer Properties...> Categorized and selected the value I wanted to categorize. In this case, I first wanted to be able to distinguish which type of power plant it is. Each type has a different color.
However, I would also like to categorize such points by the energy capacity of each plant. For this, I would like to change the size of the points if their capacity falls within a range.
How can this be done in QGIS?