Are you using a controller? In 1.4.0 it's activateable by pressing Grab when crouching, this may change in the next patch (discussion thread).
If not, then yes, there is a hotkey, X by default, changeable in the MCM panel.
There is no HUD for it, only a visual effect, because of technical obstacles I had when was making the standalone. It's doable now, though.
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Thank you so much!