How to reduce plotting output space

Question

I'm using Markdown to write my thesis dissertation.
Basically I split the screen to arrange two plot in one, but I would like to reduce the size of the entire plot. So i did this:

figs <- rbind(c(0, 0.5, 0, 0.8),   # Screen1 reduced from 1 to 0.8
              c(0.5, 1, 0, 0.8))    # Screen2 reduced from 1 to 0.8

colnames(figs) <- c("W", "E", "S", "N")
rownames(figs) <- c("Screen1", "Screen2")
screenIDs <- split.screen(figs)
names(screenIDs) <- rownames(figs)

# Left Side plot:
screen(screenIDs["Screen1"])
par(mar=c(4,4,2,1)+.1)
qqnorm(...)
qqline(...)

op <- par(fig=c(0.01,.3,.35,.78), new=TRUE)
hist(...)
lines(a,dnorm(a,mean(residuals.arima), sd(residuals.arima)), lty=1, col="darkblue", lwd=2)
box()
par(op)

#Right side plot:
screen(screenIDs["Screen2"]) 
par(mar=c(4,4,2,1)+.1)

plot(...)
lines(...)

Unfortunately what I get is the following (I've highlighted the extra space in red):

so it seems I just reduce the plot size but not the total plotting output size. How can I deal with it? I don't want to fill the gap with my picture since it would be too big.

Could we see the whole chunk and any chunk options you are using? Or does this help: https://stackoverflow.com/questions/43195871/adjusting-figure-margins-in-rmarkdown — Ryan Morton, Mar 20 '18 at 18:22
Is the space also there when plotted without rmarkdown? If yes then you need to reduce the top margin by chaning `par(mar=)` settings. if not then it should be controlled by knitr or latex parameters. — Karolis Koncevičius, Mar 28 '18 at 10:35

How to reduce plotting output space

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