Move between points horizontally and vertically. Walkable not updating?

So these 2 issues have been really bugging me the past couple days.

  1. Is there something I need to call other then “node.walkable = false” for it to update the walkable?
    After I set that, the seeker still uses those nodes as if they are walkable, and I think I have no modifiers on it unless it defaults to some.

  2. I’d like for the pathing to only get the path from node to node horizontally and vertically, is this possible?
    (The green line is how it is currently, the red line is something of how I’d want it to be):

I’m using a pointGraph.

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