external window for graphics in RStudio

despite me researches on the web, i can't find the solution
all my students are on the same Ubuntus in the same room. For only one among them, RStudio sends the graphics in an external windows (though the app R)
i understand dev.off()and it is useful in her case, but i really can't manage to find where i can indicate to RStudio that we prefer having the graphics inside RStudio

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