Hi Mara,
No, that's not what I mean. I am talking about setting the dimensions of the plot panel occurring at the lower right portion of your screen.
I know how to set the dimensions of the output, but I want to set these dimensions to the plot panel available directly into the main set of panels.
Using your example with the "Save plot as Image" window. If you set a specific width and height, you can push the button "Update preview" to resize the preview area.
What I want to do is strictly the same, but with the plot panel available in the lower right quadrant of the main interface of Rstudio.
Doing so, I don't need to use the export function to be able to see what my graphic will look like.
Hope it is a little more clearer
Thanks
Arno