The aspect ratio should be determined before you record your first shot. To avoid the issue you describe.
To guide composition, all the monitors on set (including the one the camera operator is looking at) in some way display where the image is going to be cropped. Most professional monitors will have selectable display settings to toggle through for the most common aspect ratios, and a rectangle is superimposed over the image. My monitor has red lines, but others draw dark translucent bars at the top and bottom of the image.
If you don't have access to one of these monitors, you can just put tape. I've seen people use electrical tape, but I liked using clear tape. That way you can still see the line, but you can also see what you are leaving out of the frame.
A quick and dirty method is to find an image online that represents the aspect ratio you wish to use. Print it out, and put it front of the camera. Zoom in to just where the left and right edges fill the frame. Put tape at the top and bottom of the monitor that roughly matches the position of the black lines. It's not perfect, but it'll be close.
If it wasn't for disappointment, I wouldn't have any appointments.
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