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I am sure that Okular has a following feature:

When I have already opened some .pdf file in Okular and then I will double-click on the another different .pdf file, Okular will open the second file in card, like a browser opens new page, instead of starting new Okular.

I just can't find how to enable that feature. Thanks for any help and I aplogize for my english if I made any mistakes. Anyway I hope you will know what I meant.

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There is no tabbed interface in Okular.

Read This.

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