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The 'arrow left' key is wrong in my laptop.
Is it possible change shortcut key in klayout to replace 'arrow left' when navigating layout?
unfortunately not. It used to be configurable previously, but that turned out to create too much interference with the other widgets that use the navigation keys.
But you can basically tie a mini-macro to a key using the "macro properties":
RBA::LayoutView::current && RBA::LayoutView::current.pan_left