How can I disable guest browsing mode in Chrome?

For completely disabling in Windows the guest mode in Chrome:

  • Start the Command Prompt application using Run as Administrator

  • Copy and paste the following commands into the Command Prompt and press Enter:

      REG ADD HKLM\SOFTWARE\Policies\Google\Chrome /v BrowserGuestModeEnabled /t REG_DWORD /d 0
      REG ADD HKLM\SOFTWARE\Policies\Google\Chrome /v BrowserAddPersonEnabled /t REG_DWORD /d 0
    
  • Restart Chrome.

The information about the flags of BrowserGuestModeEnabled and BrowserAddPersonEnabled comes from The Chromium Projects - Policy List:

BrowserGuestModeEnabled

Enable guest mode in browser

BrowserAddPersonEnabled

Enable add person in user manager

Under Mac/Linux these are preference names.
Their values are: 0 (Windows), false (Linux), <false /> (Mac).


After an hour of searching I found a Youtube video with an answer that currently works: https://www.youtube.com/watch?v=H_7WW4C16z4

In short, you make one registry key, log out, and log back in. Here is the contents of a .reg file that you can create to do this for you:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome] "BrowserGuestModeEnabled"=dword:00000000