Where is the undo button on the passive tree?

Hi
Where is the undo button on the passive tree? I clicked on a node but didn’t choose “x to apply” but there is no way to reverse this,it’s still highlighted and I am being forced into accepting this node as I can’t select undo and choose a different one before hitting ‘x to apply”. Also am I remembering correctly didn’t the earlier version of the game show what skills were affected by the node on the passive tree when you selected it so you could see where was best to put your points? If I am correct that this was a feature previously then this also isn’t working. Please investigate and rectify. Kindest regards.