In recent nightlies, the private browsing mode button on the home page on Android has been moved from the top right to the top left because of a news button. The news button has subsequently been removed but the private browsing button is still in the top left.
Please move back the private browsing button to the top right because of muscle memory. It's also weird how the button to activate private browsing is now on the top left, but the one to exit it is still in the top right.