MPC Designer not show line

I am using the MPC Designer on MATLAB online, yesterday everything was working fine but today, when I open the model I am no longer able to see the blue line of the response to tune the controller. I tried restarting matlab, I tried with a new simulation and with a different model but the result is always the same in the picture. The MPC is working but the line can be seen only in some regions.

Do you have any suggestions? It isn't great fun to tune the MPC without a reference.

And this is what happens with a bigger sample time:

Answer 1

[Moh Rifqy Risqullah]

click on Plot Scenario in MPC DESIGNER's Tab, and select your scenario