In a non-IJulia interactive session, by R will by default open a new window to display the plot. In order to enable interactive features, such as plot-resizing, the R eventlopp will be started automatically.
You could start manually the R event loop via
RCall.rgui_start()This runs frequent calls to R to check if the plot has changed, and redraw if necessary. It can be stopped with
RCall.rgui_stop()