As far as I know there are no built-in tools in 1c Designer to show storage space. It is not critical issue because there are always tools in SQL server where you can find this. Though this might be a cumbersome task.
However there are several modules for 1c that allows you to get information that you require. These modules should be customized for your particular infobase. Let me know if this is critical to you and we will try to get this working for you.
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