[Tkinter] Treeview expand button size

[shamnadinn]

Thank you very much for your help Larz60+,

We have managed to find it out, please add the below lines to the the code and then it will work. The expand button sixe can be adjusted by changing the values of indicatorsize and indicatordiameter

s = ttk.Style()
s.configure(".", indicatorsize = '50', indicatordiameter='50')
s.theme_use('default')