Can't center stage properly anymore

I need help. This is genuinely stressing me out, I can't fix the stage view. When I press 'center stage' usually it centers the stage.. so I can see my full canvas, without any of it being blocked off. Does that make sense? Well something happened and now when I press center stage, it blocks off HALF OF MY CANVAS!! Half of it!! I can't preview my animation or draw like that, so I now have to manually center the stage, and it doesn't look right. I need help.. 😞 I showed an example of what it shouldn't look like, vs what it should look like.