No, there is no 'universal' setting for this, especially not for pasted tables/objects.

To some extent, the behaviour is a by-product of a Word setting that automatically resizes tables to fit their contents (found under Table|Properties|Options). For each pasted table, you might be able to get the results you're after by unchecking that property and setting the table's 'preferred width' to whatever your preference is. Anything fancier for multiple tables would probably require a macro.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]