Edit the document details page

I apologize if this was addressed elsewhere but I searched and couldn't find an answer.

I'm looking for a way to edit the document details page. The table includes file name, file size, created date, and last updated date. We would also like to add the category.

I cannot figure out which file to edit.

We'd also like to add the category to the search results (table layout) page.

Any help appreciated! Thanks!