How to increase the size of the text inside the red circle of the cor plot?

Used code:

par(mar=c(1,1,1,1))
pairs.panels(data, 
             method = "pearson", 
             hist.col = "#00AFBB",
             density = TRUE,  
             ellipses = TRUE,
             pch = 21,
             cex = 1.5,
             cex.axis = 1.8,
             lwd = 2,
             rug = TRUE,
             stars = TRUE
)

Solution

Finally, I got the answer and i.e. to add the argument cex.labels = 2.5,

the final code is

library(psych)
par(mar=c(1,1,1,1))
pairs.panels(data, 
             method = "pearson", 
             hist.col = "#00AFBB",
             density = TRUE,  
             ellipses = TRUE,
             pch = 21,
             cex = 1.5,
             cex.axis = 1.8,
             cex.labels = 2.5,
             lwd = 2,
             rug = TRUE,
             stars = TRUE
)