Mobile devices – Only shows Header right menu

Hello, I'm using the adventurous theme for our webpage which I'm quite happy with. And, I've to excuse already, I'm a complete newbie in programming CSS and wordpress themes. On mobile devices if I type in our URL www.costa-vertical.com I only receive the "Header Right Menu" where you can select the language and a search option. Furthermore, you can only see the text on our static home page and not the Featured Content. Is it possible to have the same view for www.costa-vertical.com as you've got when you select the specific language homepage, i.e. www.costa-vertical.com/en If yes, please, could you explain how I could get that view for www.costa-vertical.com. Thanks and regards, Kris