on the attached simple part, the top face have been hidden / changed its transparency
how do you restore it back?
The problem may be that when trying to select the transparent face you always select the surface beneath it. If that's the case then holding down Shift will allow you to select it (or choose the "Select other" icon, then choose the face from the drop-down list).
Right click on a feature or face and select Change Transparency
That works. Thank you!
Retrieving data ...