Resolution in Game window doesn't change

Resolution in Game window doesn’t change when i am selecting another platform in Build Settings. Selecting another resolution in Player Settings menu doesn’t affect it either. I am doing this lesson

You can set resolution/aspect ratio of Game view by clicking there:

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Unity saves your last selected resolution/aspect ratio for a chosen platform (e.g. switch platform to web player set it aspect ratio 16:10, switch to android build set it to 16:9, switch to PC build set it to 4:3, and so on. Now when you’ll switch between them they will have the last aspect ratio you’ve assigned them - web player 16:10, android 16:9, PC 4:3, etc. [values provided were just for example]).

In the Game View change your aspect ratio to “Standalone (/* your resolution /)". This will make your camera view relevant to your adjustments.,In the Game view change the resolution to "Standalone (/ your resolution */)”. This will make your camera view relevant to your adjustments.