Hi Jürgen,
I know it’s confusing, but that option is used for something else: https://goo.gl/2n2bNN
If you want to add additional words, I suggest creating a custom field. For example you can make a custom field called search_keywords then enter the keywords separated by space instead of comma: https://i.imgur.com/rOlRqSu.png
Then, on the General Options -> Sources panel you can select this custom field as a source as well: https://i.imgur.com/AVO1UjI.png
I think I’m going to change that section to be less confusing, it’s not the first time someone asking help regarding this, sorry about that 🙂
Best,Ernest Marcinko
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