I'm new to AI and I'm creating an Infographic. In my file, I selected the shape I'd like to blur and then went to menu Effects-> Blur->Gaussian Blur->In this window, when I put the radius preference and checked the preview button nothing happens. Illustrator doesn't apply any effect on my shape. And I really don't why. I also tried to use other effect tools with my selection but nothing happens. Are some of my AI settings wrong? I'm using AI on Mac Os Catalina.