Adapting a 2d game to different aspect ratios?

Question

C++ / C#

I'm making a 2d platformer on PC in 16:9 aspect ratio. And if we assume that the player has a ratio of 4:3, 16:10, etc., then how to make the game adjust to the appropriate aspect ratio of the monitor? I know how to do it with ui. But how to do it with regular sprites? After all, the game is cut off nicely.

Answer 1

Controlling Aspect Ratio in Unity

Answer 2

The game is made immediately for a specific platform. When the screen is reduced, the same sprite size ratio is maintained as on the phone. Through Unity Remote you can check