Expanding a widget in Tkinter

Hello, I have a code in which I have a calendar where you can select dates.

   current_frame = set_screen_up(current_frame, current_window)
    current_frame.pack()
    title = tk.Label(current_frame, text="Schedule A Private Lesson", bg="#0d3b66", fg="White",
                     font=("Arial Rounded MT Bold", 17, "bold"))
    title.grid(row=0, column=1, columnspan=2, pady=20, sticky="nsew")
    now = datetime.datetime.now()
    today = datetime.date.today()
    max_date = today + datetime.timedelta(days=60)
 cal = Calendar(current_frame, selectmode="day", mindate=today,
                   maxdate=max_date, year=now.year, month=now.month, day=now.day,
                   selectbackground="blue", selectforeground="white")
    cal.grid(row=1, column=1, padx=10, pady=20, sticky="nsew")
    cal.bind("<<CalendarSelected>>", add_lesson)

I want the calendar to take up as much of the screen as possible but no matter I try (using weight, sticky) it stays the same size. How can I modify the size of the calendar? Thanks

Like a full screen? Would this be what you are looking for?

import tkinter as tk
import datetime

from tkcalendar import Calendar


def add_lesson(event):
    pass


if __name__ == "__main__":
    root = tk.Tk()
    root.attributes("-fullscreen", True)

    title = tk.Label(
        root,
        text="Schedule A Private Lesson",
        bg="#0d3b66",
        fg="White",
        font=("Arial Rounded MT Bold", 17, "bold"),
    )
    title.pack(fill=tk.X)
    now = datetime.datetime.now()
    today = datetime.date.today()
    max_date = today + datetime.timedelta(days=60)
    cal = Calendar(
        root,
        selectmode="day",
        mindate=today,
        maxdate=max_date,
        year=now.year,
        month=now.month,
        day=now.day,
        selectbackground="blue",
        selectforeground="white",
    )
    cal.pack(fill=tk.BOTH, expand=True)
    cal.bind("<<CalendarSelected>>", add_lesson)

    root.mainloop()

Taken from the example_2 in Example — tkcalendar 1.5.0 documentation