No fullscreen button displayed on iPhone

[AlexMGN]

Hello,

I'm in the process of integrating MapBox GL JS, which so far seems to work very well, congratulations for the work!
I want to add the control button to put the map in fullscreen, and during my tests (Safari, Google Chrome, Mozilla, Opera & Arc with iPhone 13 Pro Max), I notice that the button does not appear (it appears on the web on computer), which doesn't suit me because I really need this feature and I also need it to be accessible via a button.

I also noticed that on all the CodePen examples or even in your official doc on the fullscreen part with my iPhone, that the button is not displayed.

How can I access this button?