Keep game at reasonable scale

Hi, I'm new to Unity and I'm trying to make a 2D game... While making I start to notice that the package Pixel Perfect Camera keep changing the camera orthographic size if you rescale game in editor... That make me wonder does this apply to window game resolution too? If yes, how would I keep the game have the same scale in my monitor (1366x768) to every others resolution? I have search online for solution but I still worry.

Note that I want my game to be 16:9.

What I'm using:
- Monitor (1366x768)
- Pixel Perfect Camera Package
- Pixel Per Unit: 4

Edit: I'm an idiot, the game itself automatically scale the game for you... This thread is no longer usable. Can Moderator delete this?