With this checked, the Stroke Circle will be displayed in the PowerFlow tool. This is a circle, with a diameter that you set, that is attached to the cursor position.

This is useful in a variety of ways, but is mainly for measuring the stroke and/or the run gap between runs.

Here in this example, let's say that you want to make sure you dont have a run gap that exceeds 3". By setting the Stroke Circle (SC) at 3" and running it along the center of the stroke, you can confirm or make adjustments as needed. This can be particularly helpful if you have a thick/thin stroke with a variable number of runs.

Another way to use this tool is to think of the Stroke Circle as the light coverage of a given module. Just remember that the Stroke Circle is attached to the mouse position, which represents a "preview" module and not an actual module.

The shortcut key to turn on the display of the Stroke Circle in PowerFlow is N.