The featured content article previews can be resized with some CSS in your extra.less template.
Go to Admin Panel > Appearance > Styles > [Your Style] > Templates > extra.less and try something like this:
.block--articlePreview .articlePreview-content {
max-height: 300px;
overflow: hidden;
}
.block--articlePreview .articlePreview-image {
max-height: 200px;
overflow: hidden;
}
.block--articlePreview .articlePreview-image img {
width: 100%;
height: 100%;
object-fit: cover;
}
Adjust the max-height values until it looks right for your layout. The object-fit: cover part makes sure the images scale without getting distorted.
Quick tip — open your /featured page, hit F12 to open dev tools, and inspect the containers directly. That way you can see the exact class names and tweak the values in real-time before committing them to your template.