Python • Serial communication between arduino and python pausing when Guizero button pressed

Code:

from guizero import App, Text, PushButton, TextBox, Boximport serialimport threadingimport time# Initialize global variablespower_state = False# Initializing serial communication with ClearCore via USB cableser = serial.Serial('COM9', 9600, timeout=1)#Define functionsdef change_power():    global power_state # pulls global power variable    if (power_state == False):        power_state = True # updates to on        message.value = "Power: on" # displays power state on GUI                #command = 'on'         ser.write("on".encode('ascii')) # sends 'On' via serial to ClearCore        print("Sent: On")  # Debug print statement            else:        power_state = False        message.value = "Power: Off"        ser.write("Off".encode('ascii')) # sends 'Off' via serial to ClearCore        #ser.flush()  # Ensure the serial buffer is flushed??        print("Sent: Off")  # Debug print statementdef send_serial():    input_text = input_box.value # takes whatever is in input box    print(f"Input text: {input_text}") # check        ser.write(input_text.encode('ascii')) # prints to serial    #ser.flush()  # Ensure the serial buffer is flushed ??    print(f"Sent: {input_text}")  # Debug print statementdef update_text():    data=ser.readline() # read serial     print(data.decode('utf-8')) # check        decoded = data.decode('utf') # decode        text.value = decoded # update text in box #Creates app app = App(title="Serial Communication", height=500, width=500)#Title for power button - updated to display power_state with pressmessage = Text(app, text="Welcome")#Power button - changes power state with each presspower_button = PushButton(app, text="Power", command=change_power)#Input box for serial communicationinput_box = TextBox(app)#Send button for serial communication - send_button = PushButton(app, text="Send", command=send_serial)#Label for Received Serial dataserial_output = Text(app, text="Serial Output:\n")#Box for displaying received serial databox = Box(app, border=1, height = 200, width = 400)box.set_border(1,'black') # sets border thickness and colourbox.show() # Just in case hiddentext = Text(box,text=1) # Text widget to show read serial valuestext.repeat(1, update_text) # Updates read serial values# App main loopapp.display()