I would like to reduce the size of the words that make up my dendrogram.

My code so far, but it doesn't reduce the size of the words:

           hc_sbd_1 <- tsclust(result3_2, type = "h", k= 10,
              distance = "sbd", 
              control = hierarchical_control(method = "ward.D"))


            hc_sbd_1  <- as.dendrogram(hc_sbd_1, cex = 0.2)
            plot(hc_sbd_1)

This is my dendrogram