What is the reason why Canon EOS 760d 50mm fixed focus background is empty?

Blurred background or foreground background is essentially a problem of depth of field, which is not easy for beginners to understand, so you can study it specially. The depth of field is related to three factors: aperture size, focal length and the distance between the lens and the target.

Aside from the above principles, the specific operation is:

1, the larger the aperture, the more blurred the background (you have already done this).

2. The closer the lens is to the target, the farther the background is from the target, and the more blurred the background is.

You can make the camera closer to the target, and the background as far away from the target as possible. Just choose a satisfactory one.

Note: Each lens has the closest focal length, not infinitely close.