The polycount is always displayed in the status line at the top, but is there a way to pin it as visible in the interface itself somewhere?
You dont really need polycount as you can clearly see Points (vertices) count and when working with quad polygons and “normal closed” mesh it will be pretty same number.
Anyhow, all polygons and ngons are just “representation” of 2 or more triangles…
Dont have to go more in details for someone who really need to take serious care about that stuff.
You can move the counter around the interface - I keep mine on the bottom shelf for example. Seethis articleto learn how to customize the UI. You can’t place it on the Document itself though if that’s what you’re asking.