Remove the warnings or hints of the code output in Jupyter Notebook

In the jupyter notebook I use with R kernel, I can get procedure hints as following:

pausing 1 second between requests for more than 5 symbols

showing as enter image description here

My question is what if I want to hide the messages below the cell?

As you can see, I have tried options(warn=-1), but it could not work. The entire code cell is :

etf_weekly_returns <- function(ticker) {

symbols <- getSymbols(ticker, auto.assign = TRUE, warnings = FALSE)

etf_prices <- do.call(merge, lapply(symbols, function(x) Cl(get(x))))

etf_returns <- do.call(merge, lapply(etf_prices, 
                                     function(x) periodReturn(x, period = 'weekly', type = 'log')))

#Change the column names to the sector names from our dataframe above.

colnames(etf_returns) <- etf_ticker_sector$sector

etf_returns

}
etf_returns <- etf_weekly_returns(etf_ticker_sector$ticker)
options(warn=-1)    

Remove the warnings or hints of the code output in Jupyter Notebook