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This question already has an answer here:

I use \href to link my pdf file in my presentation. The problem is, it change my first document slide to the linked pdf. So, i have to reopen my slide again to continue my presentation. How can I make the linked pdf document open in new pdf document? (like open a new tab/window?). So, i don't have to reopen my slide presentation. Here my commands:

\begin{proof}
\href{run:./proof 3.1.4.pdf}{proof 3.1.4.pdf}  
\end{proof}

marked as duplicate by AlexG, Stefan Pinnow, Bobyandbob, Sebastiano, Tiuri May 23 '18 at 8:46

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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The hyperref manual says:

4 Additional user macros

...

\href[options]{URL}{text}

...

The optional argument options recognizes the hyperref options pdfremotestartview, pdfnewwindow and ...

Thus, pdfnewwindow is what you need. This option can also be given as a package option, acc. to section 3.9, in order to have a global effect.

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