python treeview 设置的滚动条太短怎么办？

Question

import tkinter as tk
from tkinter import ttk

window = tk.Tk()
window.title('图书查询')
window.geometry('1200x700')

yscrollbar = ttk.Scrollbar(window, orient='vertical')
tree = ttk.Treeview(window, columns=('1', '2', '3', '4', '5'), show="headings",yscrollcommand=yscrollbar.set)

tree.column('1', width=150, anchor='center')
tree.column('2', width=150, anchor='center')
tree.column('3', width=150, anchor='center')
tree.column('4', width=150, anchor='center')
tree.column('5', width=150, anchor='center')

tree.heading('1', text='类目')
tree.heading('2', text='书名')
tree.heading('3', text='作者')
tree.heading('4', text='价格')
tree.heading('5', text='库存')

tree.place(x=200, y=150)
yscrollbar.place(x=955,y=150)

window.mainloop()