I notice that all my portfolio thumbnails are cropped, I don’t have the crop section selected in the settings, how can I make that it doesn’t?

I saw another post with the same subject https://theme.co/apex/forum/t/agency-portfolio-thumbnail-cropped/16968
I tried applying the code they suggested but nothing changed.
.x-recent-posts .x-recent-posts-img {
background-size: contain;
}
Can you help me please?

