I want to play a mobile game on my desktop

Hello, everyone!
As this is my first game, I'm currently building it so that I can play it on a desktop computer. Game scenes, however, are designed for mobile devices. In the current version, I only see a zoomed-in view of the middle of the screen whenever I build it and play it on my desktop. How would I change the settings for the game to be able to be played on a desktop? There will be nothing on the sides, but the scene will be in full view. If you are able to help, I would greatly appreciate it!

 

There is no magic button to turn mobile game view to desktop one and oposite. You must put some work to redesign.