Hello Monekybini! The screenshots for this page are 20x16 tiles to fit the recommended screenshot size. The screen size in Godot is up to you really! You can fit as many (or as little) tiles as you see fit.
"When you used the tiles in godot", I'm not sure exactly what you refer to! Was it maybe in a YouTube video?
The tiles can be used at the original scale (16x16 pixel tiles). No scaling needed! ;)