how to use tabs? (open subcollection in a new tab)

My zotero just updated to 6.0, and I see that there is now a tabbed interface.

This is nice! I've always sort of wanted to have 2 different collections of my library open in separate tabs so I can flip between them more easily.

However, I can't find any documentation on how to use the tabbed interface, despite searching the documentation page of this website and the web in general... Could you please describe how to open a subcollection in a new tab?
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