Ok, now I can apply the code to the specific search instance, thank you.
1) I add a the custom field value to one post that has category Book 1 and one post to catgegory Book2. But it show up only the post that’s in category Book1 and load more show nothing. But when I unckeck ctaegory Book 1 in the filter, the post that’s in category Book2 then shows up.
2) Another thing is Load more button that shows many counts and when I click it show nothing. How to load only posts that have this custom field value, the post category, and the post tag only? Load 10 posts per time.
And here is a video to reproduce the issue https://drive.google.com/file/d/1Ywl8mboG0PeX2s_zK7kYdXEuekqo_hZq/view?usp=sharing