You can highlight freehand areas directly on images, using either a circular paint brush or a rectangle tool. You can use freehand callouts to blur out sensitive data or create a highlighted box around the content you are discussing, for example.
3. Click the Callout Properties tab, click the + Action button, and click Freehand. (Because you’re working on an image, Freehand is the only callout option.)
4. When ScreenFlow displays the tool palette in the upper right corner of the canvas, select either the brush or the rectangle tool. If you select the brush, you can set the size of the brush.Figure 50. Freehand Callout Tool Palette