Hi @Marie_Rapin6945,
Thanks for reaching out. I hope the expert's suggestion helped. If you're still facing the issue, could you please confirm which version of Illustrator and macOS you're using? Also, let me know if this happens with all files or only a specific one. Please try resetting Illustrator preferences manually and test again. You can follow the steps here: https://adobe.ly/4o9yxL3.
Let me know if this brings back the missing functionality or if the issue persists.
Looking forward to your update.
Abhishek