Burger Menu is not shown on Android Smartphones

Author Message

Posted: 5/20/2020
Quote message 

Joomla! 3.9.18
PHP 7.3
Artisteer 4.3.0

The Main Menu in the header of my site is not shown on Android Smartphones, not in Firefox nor Chrome. On a Windows based desktop monitor it is shown on simulating mode. There I can see the Burger for a small monitor resolution.

Please help!