The toolbox allows you to add neat little interactive functions to your plots.

mtcars %>% 
  e_charts(qsec) %>% 
  e_line(mpg, smooth = TRUE) -> echsart
#> Warning: package 'bindrcpp' was built under R version 3.4.4

echsart %>% e_toolbox_feature(feature = "saveAsImage") # hit the download button!
echsart %>% e_toolbox_feature(feature = "dataZoom")
echsart %>% e_toolbox_feature(feature = "dataView")