Tree template is not working

[xeroxstar]

Hello,
I am tiring to remove lines from the tree but it's has no effect, here is my code:

const table = grid.set(0, 0, 12, 3, contrib.tree, {
            label      : 'Terminal',
            fg         : 'white',
            selectedFg : 'yellow',
            selectedBg : 'black',
            template   : {
                lines  : false
            }
})

Thank you