Thank you Martin. I did this operation yesterday. Naoto Hieda have suggested to read a technical documentation, day before. So I modified configuration. Now Processing work correctly in most exemples with P3D. I have solve an other problem, Raspberry PI4 can be connected to 2 screens. Before yesterday, probably after an update or upgrade, only one sreen displayed data. Now the two ones dispay differents images.
Again thank you for your help.