Views Multiple field settings; Simple separator, doesn't sort by alpha?

In a number of view I show a field which is a content type’s term reference and which allows multiple values.

I often choose
Multiple field settings
Display all values in the same row
Simple separator

which works fine. But I would like the term references to be sorted alphabetically; I think they are presented in the order which they were created? So far I have not found any info on dealing with this.

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