Hi Frederic 😊
I’m not sure I fully understand what you mean by “my 3 point perspective disappeared.”
Could you explain the issue in a little more detail? For example, is this related to a specific drawing, lesson, or assignment? What exactly are you seeing that makes you feel the perspective is no longer working? Feel free to post screenshots or examples here, or send me a personal message if you’d prefer. The more details you can provide, the easier it will be for me to help identify what’s happening.