Hello.

Artificer template automatically calculates Width and Height for the uploaded logo image depending on the height of the Header area and saving the proportions of the uploaded image.

<img class="hidden dark:hidden lg:block" style="width:8.25rem; height:2.5rem;" src="https://us-east-1.linodeobjects.com/una/sys_images_custom/bsdvmrebtnbmdpjxctptqmpjbyumti2r.svg" id="bx-logo" alt="UNA Community Management System">

So, you need to resize your custom logo image correctly. Also you should be able to use CSS width and height if it's needed. You should have something like this:

.bx-user-unauthorized .bx-ti-left img {
width: 8rem !important;
height: 2.5rem !important;
content: url("template/images/logo-here.png");
}