Hi Enrico,
I'm not sure about the IT version, but in the US version, you can control the visibility of the opening lines a swell as the actual opening angle just like other doors. See attached screenshot. I deleted a horizontal member, selected the resulting (merged) panel, opened the settings dialog (cmd-T or ctrl-T) and changed the panel to a 'cw door 12' as shown.
Cheers,
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Ventura 13.7, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB