How to change Private Mode secret code ?

If Private Mode is already activated, you can change the secret code

From the Home screen, open the left-hand pane via the side menu ☰ top left,
Pull down the "Options" menu under your number, then go to "Number settings" and "Private mode",
Choose "Change secret code",
You can choose to change the code by first entering the code you had previously chosen.

⚠ You're the only one who knows this secret code, so don't forget it!