How to change the focus styling of a tkinter ttk.Treeview cell

Even though my Treeview has the option takefocue=False, the text in the cells is still taking focus somehow. Specifically the text column when I do tree.insert('', tk.END, text='Some Text', values=5) is taking focus, meaning there is a dashed line around Some Text. I was able to find this resource, but I am not sure of the layout string I need to change.