Start your browser in Incognito mode by default

June 11, 2024

For Chrome on a PC, drag the icon from your Start menu to the desktop to create a shortcut. Then right-click and select Show more options > Properties. There, you’ll see the URL string under “Target.” Add -incognito to the end.
On Safari for Mac, click Settings > General > Safari opens with a private window.
For Android phones, tap and hold the browser’s icon, then select Open in Private tab.
On iPhone, press and hold your browser’s icon and choose New Private Tab (for Safari) or Incognito Search (for Chrome).

https://www.komando.com/tips/start-your-browser-in-incognito-mode-by-default/