Thank you for your reply.
If I correctly understand your reply, I can modify the width in portfolio.php but it will be always the same size for all the images.
The problem is that I’m using images with different sizes. I would like to have, for each image, the corresponding zoom, with the good size, these sizes can be different.
In the Portfolio page, that’s exactly what I need. When I zoom, the zoom windows adapts its size to the image, without cropping. I don’t understand why the “portfolio” added in my page with the content manager doesn’t have the same behavior?
Thank you 🙂