How Do I Avoid Unneeded".tif_original" Files?

[plowmail2010 at gmail.com]

Windows 7
DigiKam 8.2

After fiddling with metadata, I discovered that every TIF file in my 
folders had acquired a companion with the extension tif_original.
E.g. 4800-1.tif had a companion named 4800-1.tif_original.
I did not do that.  DigiKam did that.

How do I keep DigiKam from writing into my image-file folders?

Bob