In the end, the support team advised to go to this forum and post my question here.
So, I would like to get some advice how to get the language switcher visible on my website.
Could you please share how you sorted this out? I think I have a similar issue as the language switcher is not showing on a landing page in the preview mode. We're testing it on an unpublished page so not sure if this might be the problem. It would be great to hear how you solved it. Thanks!