Immersive mode in Termux?

How can I enable immersive/fullscreen mode in Termux? I want to hide the bars at the top and bottom of the screen so that the entire screen displays the terminal. In summary, I'm looking for *either* a configuration option for enabling fullscreen mode in Termux, without reconfiguring (or rooting) my device and without connecting an external device, *or* an explanation of what happened to the fullscreen option mentioned in some parts of the documentation, if it has been removed.