What does "Set Elevator Trim" control binding do?

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Dumb question - what does "set elevator trim" command do?

Hi all, dumb question. I’ve got “elevator trim up” and “elevator trim down” mapped to joystick buttons. But I notice there is an assignable control “set elevator trim”. Any idea what this actually does? I was hoping (desperately) that it meant “set trim to whatever is needed to hold the current speed” - but it isn’t doing that at all. And pressing that button repeatedly, I don’t see the trim actually move at all. Would be nice if these in-sim commands had simple text that said what they do. Th…