Hello,
First, you need to set the demagnetization computations by clicking on Maxwell>Excitations>Set Magnetization Computation.
Then, you can plot Demag_Coe by selecting objects, right-clicking them, and selecting Fields>Other>Demag_Coef.
To visualize the fields at each time step, please enable the save fields option on the General tab of the Solve Setup dialog box.
Thanks,
Chinmay