Aspect ratio changing on play button hit

Hi, I am working on game. When i start the game hitting play button, aspect ratio is automatically decreasing. Here is a short clip in this drive link(click here). Can anybody please help me in solving this.

The aspect ratio is not changing its the scale of the game window. There is a slider for scale that is at 0.27 right now, slide that all the way to the right.

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Thank You.
‍♂️ how i have not noticed that lol.