Python - Tkinter: Scrollbar not aligning properly

The use of place can be tricky that's why you should use it only if other geometrymanager fail to achieve what you want. The benefit of the other two geometrymanagers by tkinter is that they calculate cells or parcels for you that you can use and easily recognize by just look at your layout.

I took the time to change your script and placed comments next to changed lines, that should explain what and why I think those changes are necessary.

#import only what you need and avoid wildcard imports due naming conflicts import tkinter as tk #as tk as short for tkinter from tkinter import ttk class TestingGui(): def __init__(self): print("testing") def registerUser(self): userName = "tim" userAge = "36" userGender = "male" userPosition = "softeware engineer" userInfo = [userName.upper(),userAge,userGender,userPosition] tree.column(0,anchor='center') tree.column(1,anchor='center') tree.column(2,anchor='center') tree.column(3,anchor='center') tree.insert('',0,values=userInfo) if __name__ == '__main__': window = tk.Tk() ## bonus: leading tk. symbols you are using tk window.title('Dashboard') window.geometry('925x500+300+200') window.configure(bg="#fff") window.resizable(False,False) #Window Content topframe = tk.Frame(window,width=860,height=60,bg='white') centerframe = tk.Frame(window,width=860,height=315,bg='#f0f0f1') bottomframe = tk.Frame(window,width=860,height=60,bg='white') topframe.pack(side=tk.TOP, padx=(40,0),pady=(40,0),fill=tk.X) centerframe.pack(side = tk.TOP, fill= tk.BOTH, padx=(40,0)) bottomframe.pack(side=tk.BOTTOM, padx=(40,0), fill= tk.X) ## fill = stretch in master ## padx/y are offsets like x/y in place but using their parcels ## keeping content together helps for an overview of content #frameTop Content input_field = tk.Entry( topframe, width=58, fg='black', border=1, bg='white', font=('Microsoft YaHei UI Light',15,'bold')) input_field.pack(side=tk.LEFT) upload_button = tk.Button( topframe, width=19, pady=7, text='Upload Excel', bg='#787c82',fg='white',cursor='hand2',border=0) upload_button.pack(side=tk.TOP) ## seperate the constructor from the geometry method to keep a reference ## split lines for readability compare PEP-8 Style Guide ## dont use camelcase variable names compare PEP-8 Style Guide ## the order of packing matters in this geometry manager #centerframe Content treeScroll = ttk.Scrollbar(centerframe,orient="vertical") treeScroll.pack(side=tk.RIGHT,fill="y") #tk.RIGHT = tkinter constant columns = ('name','age','gender','position') tree = ttk.Treeview( centerframe, height=13, columns=columns, show="headings",selectmode='browse',yscrollcommand=treeScroll.set) tree.heading('name',text='Name') tree.heading('age',text='Age') tree.heading('gender',text='Gender') tree.heading('position',text='Position') tree.pack(side=tk.TOP, padx=(30,0),pady=10) treeScroll.config(command=tree.yview) #bottomframe Content add_user_button = tk.Button( bottomframe, width=19, pady=7,text='Add User', bg='#57a1f8',fg='white',cursor='hand2', border=0) #command= lambda : TestingGui().registerUser())#DONT DO THIS! ## Only use lambda if needed ## It makes little to no sense to initiate a class in a lambda expression add_user_button.pack(padx=(30,0),side=tk.LEFT) #start mainloop tk.mainloop()#indention correcture