Hi rclpris
By default, JA Blockk uses text logo and it's styled with max-height of 40px, you can edit your logo image to the dimension you wish and change the max-height value to the same.
@media (min-width: 576px){
.navbar-brand.logo-control img.logo-img {
max-height: 40px !important; /*change to your desired value*/
}
}
For the author, if you want to hide this info, you can use this custom CSS:
.item-page .author-block-post-detail {
display: none !important;
}