Polylang and missing headers and footers

I’m using muzze-child-theme and I am building the page. Even if I am a beginner is user friendly enough and I can manage. BUT. But when I installed Polylang free to create the multilingual site header and footer both disappeared. If I deactivate the plug in they are back.
Can Anyone help me, please? What’s wrong?


Contact with your purchase item author hope they will helped!