Try the following changes to your
about
function:
def about():
logoimage = PhotoImage(file="beatcinema.png")
aboutroot = Toplevel(root)
aboutroot.title("About BeatCinema")
aboutroot.geometry("235x198")
aboutroot.iconphoto(False, logoimage)
aboutroot.resizable(False, False)
aboutlogo = Label(aboutroot, image=logoimage)
aboutlogo.place(relx=0.5, rely=0.0, anchor=CENTER)
aboutroot.mainloop()