Help me to fix this guy's

Question

https://code.sololearn.com/W0h05gPvw3qp/?ref=app

Answer 1

Sorry in my English I'm Bad On It🥹 ==> When I click the btn2 it's glitching and in My project i need when I click the back button in my phone the frame display is gonna hide but when I click in Btn2 I need click twice in back button so how I fix that