ArcPro has the graphics layer which you can capture ad hoc graphics into.
Something I do in ArcMap is draw a graphic circle in a map (not layout) out to an approximate radius and I can do this because ArcMap shows in the status bar this information as shown below
The tool for drawing a circle in a graphics layer does not show this important information, so you have no idea what the radius of your circle your are drawing is.
Please enable ArcPro to show this. If you use the measuring tool you get a little tool tip box that follows your cursor around. Either have something like that or report it in the status bar.