Canon 77D photography, how to blur the background of the whole picture?

The depth of field depends on three factors: aperture, focal length and shooting distance. It can be known from the calculation formula that the larger the aperture, the longer the focal length, the closer the shooting (focusing) distance and the smaller the depth of field. To blur the background of the whole picture, we should not only control the small depth of field, but also pay attention to the background as far away from the subject as possible. Press this setting to shoot a blurred background.

I hope to adopt.