Hello,
The Education Hub Pro theme automatically sets the flexible height and width for the image used in logo upto 110 px in height.
You increase the logo size by uploading the image of height larger than the max-height if you want to increase the logo image size in the header. To do so, please add the following custom CSS in your Admin Dashboard > Appearance > Customize > Theme Options > Advanced Options > Custom CSS field :
.site-logo-link > img, .custom-logo-link img {
max-height: 131px;
}
You can increase the value of max-height in px as per your image height / requirements to get a greater sized logo in the header.
Hope this Helps,
Best Regards !!