Move Automation Node only Vertical or Horizontal

Is it possible to lock either horizontal or vertical direction when editing automation nodes with a mouse ?
Many times I want to move automation up or down, but not left or right, or vise versa. And most of the time I end up moving it both ways, which is very annoying.

EDIT: My answer was incorrect - the right answers are below:

Do the default keys not work on it?
Press STRG/CTRL after started moving a point in one direction,
should prevent it from moving in the other direction.

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@st10ss and @steve :
I can’t believe I didn’t know that or bumped into it !! - Embarrassed, yet grateful! Thank you!

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Will try this asap. If this works this will a major workflow improvement for me