I am used to search in the web for the vignettes of the packages, but sometimes it is useful to access the one in the computer. In this occasions you can use:
vignette(package="UpSetR") # To know if there are vignettes and their name
vignette("set.metadata.plots", package = "UpSetR") # Open one of the vignettes
vignette(package="UpSetR") # To know if there are vignettes and their name
vignette("set.metadata.plots", package = "UpSetR") # Open one of the vignettes