Warning sign in "Step 2: Time Dependent" node in COMSOL

Hello guys,

I am solving a ODE in COMSOL which is coupled with AC/DC module through the velocity (Lorentz term) in "Magnetic and Electric fields" interface. When I choose "study controlled" in Equation form of this interface, as shown in picture 1.1 attached, the solver converges quickly and I get good results, at least their trends are reasonable. However, in this case, a "Waning sign" appears in the node "step 1: Time Dependent" which the picture 1.2 shows that. Is there any problem with this "Warning sign" or not?

Could you please tell me the here what does "study controlled" mean? I checked the COMSOL help but did not find related comments about this.

In another case, when I choose "Stationary" in Equation form of "Magnetic and Electric fields" interface, it can be seen in picture 2.1, the "Warning sign" disappear and I can see the "Green tick sign", see picture 2.2 please. But the problem is that my model in this case does not converges !!!

Any help or idea would be appreciated.

Thanks,
Mohsen