You cannot turn it off, but there are two things you can do.
First is to just close the recovered file when it opens. It has nothing to do with the file saved on disk previously (which may or may not have been damaged inthe crash). Unless you save the recovered file to the same name and location, the original is stillintact, though missing any edits since the last save.
The second is to empty the recovery folder after the crash. Nothing in the folder = nothing to recover.