Is there a way of accessing a player's full screen size?

Every device size is different therefore, so is there screen. Is there a way of accessing the players device size.

I tried using ScreenGui.AbsoluteSize, but it stays fixed.

Is there another way of accessing player's screen size not remaining fixed.

For example, if I lower the size of roblox in a game, the screen size stays the same as the size of the player's screen.