To make blog feature image unclickable, you can use these CSS code to Website Tools > Custom CSS
#1. All blog images
div.collection-content-wrapper .blog-item .image-wrapper { pointer-events: none; }
#2. Images belong specific Blog Page
First, you need to find Blog Page ID. Use below tool.
In my example, it is: #collection-6677756d03a4f15ba27ce9d8
Next, use CSS code like this
#collection-6677756d03a4f15ba27ce9d8 div.collection-content-wrapper .blog-item .image-wrapper { pointer-events: none; }
#3. Specific blog image
First, you need to find blog item url slug by access Settings
You will see this.
Next, use CSS code like this
article.blog-item a.image-wrapper[href="/blog-2-1/the-mountai-bike"] { pointer-events: none; }