Why does the font type change when I open a plot in a new window?

Question

I'm coding in Rmarkdown and I prefered to change the font type of my plots using the following code:

windowsFonts(timesnewroman = windowsFont("Times New Roman"))

and in a ggplot plot adding:

 ... + theme(text = element_text(family = "timesnewroman"))

When I then open the plot using "Show in new window" button the font changes to the default font as it is in R plots in normal. How can I avoid this change? Because when I open it in a new window I take a screenhot of the plot and use it in my report, so I don't wanted that the font type changed to the default. What can I do? :/

Answer 1

So, based on the answer given by @user2554330 the following worked for me:

library(cowplot) # use this library to use the plot_grid function

# saving the plot as an image with the prefered size
png(filename="my working directory/myplot.png", width=850, height=450)

plot_grid(plot1, plot2, labels = c("A", "B"), 
          ncol=2, nrow=1, 
          label_x=0.45, 
          label_y=1.040, 
          label_size=13)
dev.off()

Using these codes the image with the size of I want is saved into my folder/working directory.