This article describes features available in non-block themes. When using modern block themes, please refer to the Related Posts block support page.
Hide the post date on the Related Posts
The appearance of Related Posts can be changed in the customizer, by going to Appearance → Customize → Related Posts and then viewing a single post.
Do not add any context below each Related Post
By default, Related Posts include some context to explain why that post was chosen. It can be because it belongs to the same category, or because it shares the same tag.
You can remove that context via the customizer as shown in the screenshot above.
Jetpack