I have the same issue as the OP.
Coverpage is used to place three action button for 3 different languages (English, French, German). Once the visitors choose their language they are staying within the same language unless they return to that homepage. Only when you click on the logo, you'll return to this coverpage.
I noticed that this system started to perform less on SEO.
For the home page I'm thinking of replacing the cover page with a standard layout page, with a hero image and headline, allowing me to add crucial information for SEO. Then having three buttons pointing to the other languages. You'll either stay in English “Continue in English”, or choose one of the other two languages.
Here I see the problem that the English menu is visible.
Is there a workaround to prevent the menu from showing?
Appreciate your input!