How do i block space bar input in the jump option of the input manage?

I am doing a platform game and i configured the input manager to use the “up” key and the “joystick 3” to jump, but if i press the “space” key it also jumps. I can’t find a way to block the “space” key from jumping.

Do you how to do it?

I put here an image of my Input Manager Configuration.

Make the field that says “Negative button” blank. Currently it says “space” which means space will be used for negative jumping.

I just did it and the space key keeps doing the same.