Text resizes depending on screen size?

See this video, depending on what resolution the game runs in the text appears at a different size. I haven’t toggled on best fit and the canvas does scale with screen size. However I did notice something, on the canvas scaler script the reference resolution is 800x600. I’m running the game in a different aspect ratio, if I change it to the default resolution of the game the UI layout is messed up. But even at that resolution the text seems to change when you scale up or down the game. So is there some way to make the text appear at a perfect size?

Good day.

Ypu have the option in canvas to scale with ratio, or permanent pixel size, etc…