Responsive Theme not zoomable on mobile device

Hi All,
I just started using Rapid Weaver 6 in order to create a website for our Kuk-Sool-Won Club. We just need a small Website with some contact Information.
I used the Black Shadow Theme by Multithemes. Now I wonder why I cannot zoom in the image or text I used within the Website on my mobile devices. Couldn´t find answers in this forum yet. I am desperate, can anyone help?

@SteffiPM :-

Hello Steffi,

From the code in your head section of your theme it appear you should be able to scale but may not be much as you would expect

refer to this post for more details and try changing some values like of Maximum-scale and see if you can achieve what you want:-

hope this helps,