Gallery image modify size - Square.

Hi,

I'm trying to modify the image size in a gallery module. I'd like to have them square and not portrait or landscape.
What I did so far is to modify the thumbnail of the image using : "Simple Image Sizes" module https://wordpress.org/plugins/simple-image-sizes/

I modified the "et-pb-gallery-module-image-portrait" size by 415 x 415 instead of 400 x 516.
I modified well the image into the FTP folder. I can find an image img-400x400.

But in the gallery module the image size is not triggered. I get this well i look the code :
<div class="et_pb°gallery_image portrait">
<a href="https://www.be/wp-content/uploads/2018/12/img.jpg" title="text">
<img src=https://www.be/wp-content/uploads/2018/12/img.jpg" alt = "text">
<spam class="et_overlay et_pd_inline_icone" data-icon=".">
::before
</spam>
</a>
</div>

But I believed I would have this instead :
<div class="et_pb°gallery_image portrait">
<a href="https://www.be/wp-content/uploads/2018/12/img.jpg" title="text">
<img src=https://www.be/wp-content/uploads/2018/12/img-415x415.jpg" alt = "text">
<spam class="et_overlay et_pd_inline_icone" data-icon=".">
::before
</spam>
</a>
</div>

Do you have an idea what am I doing wrong ?

Thank you,
M.

 

Many thanks !!!!