Excluding of Folders / Norton Security for Mac

I know how to exclude folders from the automatic search, but after each re-start of the mac Norton scans "everything" again and everything I excluded in the list is deleted; there is an empty list.

I tried it several times, always the same problem.

Hope someone can help!

Norton Security for Mac 7.3

MacOS Sierra 10.12.3 (the problem existed also with other versions of the OS)

Norbert