Scale bars have disappeared when working with plots

Hi, In all my plots the xlabs, ylabs, and scales barely visible in R studio. Below if an example of a phenogram I plotted. I have also checked and I cannot see the scale with even a basic plot funcion 'plot(x, y). Can anybody advise on why this is the case?

setwd("/home/chris/R/Hominin trees phylo sig")
require(ape)
require(geiger)
require(phytools)
require(strap)
require(caper)
tree<-read.nexus("fifth-app-2.nex")
tree
plot(tree)
multi2di(tree, random = TRUE)
ages<-read.csv("ages_2.csv", header = TRUE, row.names = 1)
hominin_tree <- read.csv("hominin_data_2.csv",
header = TRUE, row.names=1)
hominin_tree
name.check(tree, ages)
name.check(tree, hominin_tree)
tree<-compute.brlen(tree, ages$FAD, ages=1)
tree<-DatePhylo(tree, ages, rlen = 1, add.terminal = TRUE,
method = "equal")
###########

svl <- hominin_tree
svl <- as.matrix (svl)[,1]
phenogram(tree, svl,fsize=0.7, spread.labels=TRUE)

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