Question

I know how to specify font for a concrete plot, but is there a way to specify it once for all subsequent plots, histograms etc?

Answer 1

Using par. In the following example, I assume you want to change the family setting but refer to ?par for an exhaustive list of graph parameters you can change:

old.params <- par(family = "mono")

plot(cars)
hist(islands)

When done, you can reset everything to the old defaults:

par(old.params)