Extract titles using rvest in R

I am trying to use RVEST to extract 50 titles in Bing News main page. But I don't know what's happening with my code, it only displays 6 titles. I scrolled down to load more titles, but it still doesn't work. Here are my code:

install.packages("rvest") library(rvest)

covid_wbpg <- read_html("https://ift.tt/3itgwpn)

covid_wbpg

class(covid_wbpg)

covid_19 <- html_nodes(covid_wbpg, ".title") %>% html_text()

head(covid_19)