How to Merge Citations

I try to add few citation after sentence. But all of them appear as separate citations: like [1][2][3] or (Autor1 et al. 2017), (Autor2 et al. 2017), (Autor2 et al. 2017)
But it should be combined as [1,2,3] or [Autor1 et al. 2017; Autor2 et al. 2017; Autor2 et al. 2017]

I know that Endnote automatically combine multiple citations, but I can't find how to do it in Zotero.
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