As is known, the arc length dimension displays an arc symbol to differentiate itself from Linear or Angular dimensions.
An arc symbol can be displayed either above or preceding the dimension text. Of course, we can choose not to display the arc symbol.
To change between those three options, Enter “DIMSTYLE” to open the “Dimension Style Manager” dialog box,
Click “Modify” button in the “Dimension Style Manager” dialog box, then the “Modify Dimension Style” dialog box would pop up, as shown in the following picture,
Click “Symbols and Arrows” tab in the newly popped-up “Modify Dimension Style” dialog box, have you seen the “Arc Symbol” section? That’s where we can change different placements of an arc symbol.