If you want to remove Blog Pagination (screenshot).

You can use these below CSS code.
#1. Remove blog pagination on all blog posts
Use this CSS to Custom CSS box.
section.item-pagination[data-collection-type^="blog"] {
display: none;
}

#2. Remove blog pagination on Desktop Only
Use this CSS code
@media screen and (min-width:768px) {
section.item-pagination[data-collection-type^="blog"] {
display: none;
}}

#3. Remove blog pagination on Mobile Only
Use this CSS code
@media screen and (max-width:767px) {
section.item-pagination[data-collection-type^="blog"] {
display: none;
}}

#4. Remove blog pagination on specific blog page
First, you need to find Blog Page ID. Use this tool.
In my example, we will have:
- #collection-6677756d03a4f15ba27ce9d8

Next, we need to change # to . symbol, so new ID will be:
- .collection-6677756d03a4f15ba27ce9d8
Next, use this CSS code:
/* remove blog pagination */
.collection-6677756d03a4f15ba27ce9d8 section.item-pagination[data-collection-type^="blog"] {
display: none;
}

#5. Remove pagination on Specific Blog Post
You can edit blog post > Add a Code Block

and Paste this code
<style>
section.item-pagination[data-collection-type^="blog"] {
display: none;
}
</style>
