Sidebar not showing on any page

I have enabled it, read some entries on the forum, still can't find where resides the problem. It is for  this website : https://www.c-benevolat.fr/ If I change themes it works, I don't want to change it but I need a sidebar on the website The sidebar worked for a week when I installed the theme but it doesn't work anymore (without my intervention). I hope I have provided enough information. Thank you in advance.