Hi Stefano: From the Solid Designer 3d module, click your right mouse bottom and go to viewport settings, in the viewport table under projection select perspective and them close the table. Go now to the Annotation module and click the View, the under view click general and when the table of direction 3d appear just click in the VP Dir and click inside the viewport that have the 3d solid in perspective and click ok. Just put in your sheet and them make a view update. I hope this can help.