The button at the top of the form to change the language is no longer being shown on the form

We are trying to create a form in French, but the multilingual button at the top right of Jotform seems to have disappeared.

The reason why the button is not shown is because your form does not hold multiple languages. As soon as you have only one language, the language switch option gets hidden to make sure that people are not clicking on it thinking that there are more languages available, while there are not.

To resolve this simply add a new language by following the steps here: How to make your forms multilingual? and you will quickly notice the same option being shown on your form once again.