XER File Size

I recently noticed a doubling in size for all my .xer files.  I recently changed summarization level, WBS level limit (number of levels down) and activity ID length.  I reset these data limits back to the previous level, but my .xer files remain large with no decrease in size to what I had up to a couple weeks ago.  Please advise what a solution may be.

Thanks,

Michael Thibodaux