Hello Ivo!
I have installed People particle and in mobile view the hamburger menu totally disappears after clicking on it.
Please have a look here:
https://drive.google.com/file/d/193R4WhEzWA9Px4OD1ZUDvGGaqOC1djfv/view
Or live here:
https://929szentmihaly.hu/csapatunk/bemutatkozas
What would be the problem?
Thanks,
Tegger