From Google translate:
If I create a symmetrical metal plate. When I make plane 2d, it will not let me do the unfolding. It does not appear in the list of views. I can do this by changing the view settings, but the fold lines do not appear to me. Could you help me? I have tried to enter view properties, but it does not let me the option to click on "view sheet metal fold notes".
Thank you so much
Have you used the sheetmetal tools to define your plate?
If no, then the software won't know that it needs to be unfolded.
If yes, can you share a screen shot of your workflow?
Translated to Spanish via Google Translate:
¿Ha utilizado las herramientas de chapa para definir su placa?
En caso afirmativo, ¿puede compartir una captura de pantalla de su flujo de trabajo?
I found the solution.