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I don’t know wezterm but in xterm you can make a button toggle the second screen, and this can be nice for switching between the manual page you were just looking at and the line you are typing into.

I also prefer this to having a fucked up scrollback.

I think that varies case by case. Sometimes "intermediate" output should disappear because it's less interesting than what I had before. Sometimes it should not disappear as you write. To implement that the shell prompt would need to contain a special esacape sequence as a marker and then the user can manually hide the output of the last command. Or to make it even more fancy: Hide and unhide output of any previous command.

Try LESS='-X'