Unity Camera Changed Size

The issue:
I’m following a tutorial in a book, so I didn’t enter any code that affected the camera. However, when I went to test my game, I noticed that the camera’s aspect ratio had changed significantly, so that it’s a tall rectangle, as opposed to the horizontal one that was there before (which is the one the file had started with).
None of the settings are different in the Inspector and I’ve experienced this issue before. When I looked up possible answers last time, someone suggested starting over from scratch - which worked, but I’d rather not do that since I’ve come so far.

What I’ve tried already to fix it:
I’ve tried deleting it and adding a new camera, but they all get added in with the same aspect ratio that the Main Camera has now. I’ve also tried resizing the aspect ratio by making the W 1.75 instead of 1, but for some reason, that made it so none of my objects in the scene were visible.

Does anyone know how to fix this? It seems like a bug and this is the first time I’ve ever run into it.

i think i know what is going on with you, Your Aspect is either 5:4 or something along that line.

to fix it: on the game screen click this area, it’s normally located under the ( Game window )
IMAGE:
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i highly think that’s the issue that is going on.