Hi Federico,
There is also a workaround for it. if you want to see the simulation of both inner walls at the same time then you use the viewport option to see the simulation result of both inner walls on two screens. Adjust the screen according to your requirements. You can find the viewports option in the "Display tab". 
Let me know if it is helpful or not. You can adjust the different views of the simulation.
Regards,
Sampat
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