problem with language switcher button in main menu

There are now two snippets for this. See if they help:
https://www.themesandco.com/snippet/add-qtranslate-flags-menu-2-quick-easy-ways/
https://www.themesandco.com/snippet/add-qtranslate-flags-navbar-widget/

Read also How to customize Customizr if you use the second snippet.

If your site is brand new, and you have yet to set up the pages/translations etc, I’d recommend Polylang. You will need the Polylang bridge code for the current version of Customizr.

thanks ElectricFeet! I try to understand something…
I’m making this on a WP with Retigo theme, so i don’t know if the problem is on WordPress or on theme.

Hei ElectricFeet! Thanks for the input!
I realized what my problem is …
I put “/en/” and “/it/” in the URL. I thought that the link was contextual of the page that I visualized. I thought that by click on the flags would take me back to the same page translated in the right language. I realized that I have to put the full URL, and the link always refer to the homepage.

p.s. Sorry for my bad english!

For the quick and easy ways, yes. But for the widgetized solution (the second link I gave above) it will go to a contextualised page.