There are 3 main display options for the Service Block meta box.

Here is a screenshot from the documentation:

In order of appearance in the screenshot:

A) Vertical layout (can be 1-3 in a row, always shows as circled style)

B) Horizontal layout (1-2 in a row, can be standard or circled style)

C) Horizontal layout "3 column" where the middle column is an image