Hello Ziggy, I solve the problem, my website was very far in the google search but it was there. I click on it about 10 times after a search with good keywords (site name) and now it's on the the top.
Maybe you can help me with other thing: In the google search, the top name of my website appear with the website adress (placelongue.fr) not the title (name) of the company (Place Longue). I choose this name on the title part of my website creation.
And yes I optimize it in the SEO part of squarespace.
Thanks