Hi Saguaros,
thank you for your reply.
On my production website, I went back to the version 3.27. It works well. The hamburger menu is displayed.
I gave you all access to my test website. The credits are in the fields.
The Creativity version is 4.0.
I also disabled JCH and the cache.
The hamburger menu is there but not displayed.
To test: migration.guillenphoto.com.
I hope that you will find a solution to my issue.
Sincerely,
Amar Guillen