Without-relations filter

Is there a filter or something (from the URL) to specify that I don’t want the ‘relation’ fields?

For example, I have Post → Comments, and a page where I show only the title of each post, for that page, is not necessary the ‘relation’ fields with comments. But if I click on a post, it will go to a page where I need the comments, so in that case, I will request some post with the relation fields