A strange bug... If I click on "What's new", I have the new threads page that appears but on the other hand the tab remains blocked on Forums. I checked for the templates, everything seems correct. Please do you have any idea of this anomaly?
Using xenforo demo, I went to see the configuration of What's new in the Public Navigation page. And there I saw that my link was wrong, I didn't think to copy the error. I replaced it with the link of the demo forum and now it works great.