Hello @mikwalrus,

The Photo Perfect Pro theme already has necessary Styles implemented for the gallery images when the images same size ( landscape/ portrait ) images are used in the gallery. However, in the page you have provided the link to, the uneven image sizes are creating extra spacing between the images.

You can use the following custom CSS targeted specially for the gallery in your page in your Admin Dashboard > Appearance > Customize > Additional CSS to decrease the spacing and better align the images in the gallery :

.galleryid-369{
    margin-bottom: 15px;
    text-align: center;
}

.galleryid-369 .gallery-item {
    width: 17%;
}

Hope this Helps,

Best Regards !!