Selecting that option should show graphically which direction the current flows, the linetype changes to one with arrows on i.e. ------->------>-------.
This feature uses AutoCAD linetypes, the following changes to a drawing can prevent the "Display Current Flow Direction" from working:
- Changing the default linetype of a wire away from "Continuous"
- Purging the linetype _VeSys_Sneak from the drawing. When the current flow direction is switched on it converts the linetype from Continuous to _VeSys_Sneak
- Changing the default text style "Standard" font from "text.shx" to something else can change the appearance of the Wire Current Flow