To prevent your real name from displaying in MATLAB, you can change your username, which is what's actually shown. This change is made through your MathWorks account profile.
If you want to hide your name temporarily, you can also sign out by clicking on your name and selecting "Sign out." You won't need to sign in again until you want to install files using the Add-On Explorer.
You can refer to the following MATLAB Answers post to know more
Hope this helps!
