Reza Rad has something up his sleeve:
To tidy up your Power BI solution, there are some options, and one of them is hiding fields from the report view. This option, although simple, has a significant impact on making your Power BI solution very tidy and clean and easier to maintain. However, you might wonder what are fields that have to be hidden in Power BI? In this article, I will explain how to hide a field in report view, and then what are fields which are a good candidate for this option. If you like to learn more about Power BI. Read Power BI book from Rookie to Rock Star.
The very short answer is, hide things that business users won’t (or shouldn’t) care about. Reza gives much more guidance on the topic.
Based on the comments section, this appears to be a re-post from several years ago, but still worth reading because the content is evergreen.