How to display multiple plots in R Scripts running in QGIS

To create a new window for each plot, use the windows() command. Editing your code to the following should create each plot without overwriting the previous results:

##showplots

bin_arr <- c("C:/Users/Madhur/Desktop/Screenshot_1.png", "C:/Users/Madhur/Desktop/Screenshot_2.png")

shp_arr <- c("C:/Users/Madhur/Desktop/SAR_Calibration/Screenshots_SAR/final.png", "C:/Users/Madhur/Desktop/SAR_Calibration/Screenshots_SAR/Screenshot_2.png")

library(imager)

im1<-load.image(bin_arr[2])
windows(); plot(im1)

im2<-load.image(shp_arr[1])
windows(); plot(im2)

im<-load.image(shp_arr[2])
windows(); plot(im)

In fact, I cannot display many graphics. Only the last one, as you say. I arranged a way to store my graphics in files, then I am able to see all of them.

My code is very different than yours, but you will be able to find out.

##showplots
require(ggplot2)  
Size = 10
x = 1:Size
y1 = x^2
y2 = x^3

>print('Graphcis are in this directory')
>getwd()


png('y1-plot.png', 800,800)
plot(x,y1)
dev.off()
    
png('y2-plot.png', 800,800)
plot(x,y2)
dev.off()

ggplot(data.frame(x,y1))+
  aes(x=x, y=y1) +
  geom_line()
ggsave('y1-ggplot.png')

ggplot(data.frame(x,y2))+
  aes(x=x, y=y2) +
  geom_line()
ggsave('y2-ggplot.png')

In my directory, I can see four graphics.