The Miscellaneous tab of the Proxy Table property sheet has the following components:
Maximum table width Shows the number of bytes required for each row in the proxy table. The number is calculated from the length of the string columns, the precision of numeric columns, and the number of bytes of storage for all other data types. If the proxy table includes long binary or long VARCHAR columns, their arbitrary widths are not included, so the row width can only be approximated.
Number of rows Shows the approximate number of rows in the table. This option is not available for proxy tables.
Calculate Determines an accurate row count for the table. This button is not enabled for proxy tables.