Thank you for your answer. We deactivate Colormag for another theme, and when we reactivate it, the problem is solved.
Best regards.
Same problem, menu disappears immediately on mobile at https://convergences-smartcity.fr/
I do not make any CSS or PHP customization.
No problem using the same theme on other sites.
Rgds.
Patrick GERMAIN https://webadmin.fr
Seem to be corrected, now. Thank you.
