When you open a WSL Distro on your Windows computer, it signs you into a particular default user account. You can change this default user if you want. You need to open Command Prompt or Powershell ...

The shared PC mode in Windows 11/10 can be applied to Windows 11/10 Pro, Pro Education, Education, and Enterprise. When in shared PC mode, only one user can sign in to a Windows machine at a time.