<Hamburger Icon not showing for second time when I...

# stackoverflow

[user]

Hamburger Icon not showing for second time when I go to other Fragments
First I have made a button navigation with three Fragments in Main Activity and I made a Hamburger Icon in Toolbar , when I run the app , hamburger icon work correctly for the first time

first image▾

but when I go to other fragments or comeback to home fragment, there is no hamburger icon.

second image▾

and here is my codes :
Main Activity :...