Adding something like the following to the module's CSS file would make the select boxes more user friendly:

select#edit-filters-destinations-db-exclude-tables,
select#edit-filters-destinations-db-nodata-tables {
  height: 20em;
  resize: vertical;
}

Frank

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couturier’s picture

couturier CreditAttribution: couturier as a volunteer commented
Issue summary: View changes
Status: Active » Closed (won't fix)

I believe this has been addressed in the newer branches of the module and will certainly be a factor in the D8 version going forward.