hi @Interstellar_Vagabon thanks for reporting. I just tested this in both V6 and V7 and found the behavior to be the same. Repositioning of the arrow can be done by dragging the arrow handle, repositioning the text by dragging the text handle.
Indeed in Layout Space this is not possible, I logged that as RH-71653 Editing Radial Dims or Diameter Dims in Layout Space doesn’t work as expected
There is however a workaround: you can select both the center point and the arrow handle, and rotate these simultaniously.