I have 2 treeviews, and I want to set the row height for first to be 45. Im using style but when I change the row height for first treeview , it automatically chang
The Treeview style is the default style used for all Treeview widgets. If you change that, you change all Treeviews. If you want to change only one Treeview, make a new style based on the default Treeview style and alter that (reference):
s.configure('MyStyle.Treeview', rowheight=45)
NewTree= ttk.Treeview(myApp, height=4, style='MyStyle.Treeview')