Hello,
Maybe this article will help: Wix Multilingual: Customizing the Language Menu on Your Mobile-Friendly Site | Help Center | Wix.com
Here is also a tutorial on how to properly create a multilingual site using the wix language app:
Wix Multilingual: Switching from the Wix Language Menu App to Wix Multilingual | Help Center | Wix.com
Best of luck,
Massa