How can I increase the plotting area of a corrplot for better visualization(i.e., make the graph bigger)

I´m using the following code to get the corrplot

cor_5 <- rcorr(as.matrix(datos))
M <- cor_5$r
p_mat <- cor_5$P

corrplot(M,type = "lower",p.mat = p_mat, order = "original", sig.level = c(0.001, 0.01, 0.05), pch.cex = 0.9, 
         insig = 'label_sig',diag = FALSE, col = brewer.pal(n=8,name = "RdYlBu"), tl.col = "black", tl.cex = 0.8, tl.srt = 45,mar = c(0,7,7,0))

This is the image I get

The real name of my variables is a little bit larger (2- 3 words) and the resulting size of the plotting area is smaller. How can I get to use the whole visualization area?