What OS? What version of Obsidian?
What method or command are you using to create a new note?
Can you show a screenshot or something? Does this happen if you turn off all themes and community plugins? Does this happen in the Help Vault?
There is a way to distinguish files and folders. Folders have a triangle arrow beside them, for opening/collapsing them. Files do not.

If you don’t see that, you might have an issue with a CSS theme. Do you use a theme?